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If you don’t know much about the God you want to worship, start with research, read and learn about them more. (Always a good place to study about the Netjeru is Henadology website.)  

After learning more about the Deity, you can start worship. It’s not required to do any formal rituals of “introducing yourself”, however there are examples of such rituals if you feel so inclined.
You may start simply with a short prayer and offering. Or just with prayer, as prayers always is more important than material offerings.  
You may start offerings with candles and incense, later offer something edible. It’s never wrong to offer Netjeru water, bread, fruits and sweets.
Kemetic offerings are usually “reverted” after some time of being presented to the Netjeru. So, offer the things you will like to consume yourself, later!
 
And if you already reached the God/s and established the devotional relationship - then work on this devotion more than on the offerings.
Show them your love. Think about them. Repeat their names in your mind. Say them praise. Study about them. Use the opportunities to see more of their pictures and read more about their mythology, cult, ways of worship. Contact other devotees of that God and see their experiences.
But before all, IMHO, is thinking about the God/s, keeping them in your mind, let them make a shrine in your heart.

They welcome our love and devotion more than material offerings. Material offerings are more for us than for Them, because they help us to keep our attention focused and concentrated.
The same thing is with holy images and statues. You may look at the pictures of the God on line, you may make a home shrine, but most important is to welcome them into your life and your heart.

Because what else was your goal in connecting to individual God?
You want to be their friend, perhaps. And yes, this means that they would influence your life. This does not happen in one moment. But you may find eventually that you start changing “in the likeness of the God”. Their values become your values. Their goals and agendas become yours. You start to love what they love, and reject what they reject. You think about them more and more, you wake up with first thought of saying hello to the God.

"Come, let me cause you to know them,
namely, the four principles of life…
to bind with them -
Set your heart upon god!
Adhere to the law!
Make revenge!
Go in ma'at!"
Be small of wrath!
Be thoughtful!
Be a good man!.."
"Conversations in the House of Life" ("The Demotic Book of Thoth" - 388-390)

If you feel called to Kemetic religion and wonder what should be your first step, my answer always is “Just make that step”. Come before the Netjeru to walk on the path of Ma’at and prepare a place in your heart where your honored Gods will reside, making your body and soul into their temples; guiding your boat on the waters of life.

If you have attraction to certain Netjer, by whatever reason, try talking to that one.
Even if you just consider the deity to be handsome. This also is a valid reason :)
If you are attracted to the pantheon as a whole, address them all, as one divine family… and ask if someone wants to take a larger role in your life, to “step in”.

Once you let them in (as living gods- they may reside in your heart), even if you don’t think about them often, they think of you :)

It’s not required to think about the Gods every single minute of your life, but it makes one happy when you know that deities are loving, caring, helpful and ready to hear your prayers, your praises, and the sharing of your concerns and worries with them. They are like your family and friends; think about your prayer/shrine time as about divine phone call or skype chat with a close friend who is not physically present, but always ready to answer your call and listen.

If you are drawn to several Netjeru already, then start doing more for them and learn more about them.
 
You do not have to have one central Netjer to work with. There is more likely to be several. In Ancient Egypt it was not common to choose only one Netjer to serve/“work with”. People had personal devotions, and may be had their favorites between Netjeru; but more common case was that there was a group, or “family” of the Netjeru who were closer to that particular person.

Frequently it was defined by the place they lived in and other circumstances. We know accounts of ancient Egyptians who had Netjeru appearing to them in dreams, and this causing their focus of devotion to significantly change. There are recorded stories of people who were called for intense devotion by Mut, Aset/Isis and Djehuty after the Netjeru making clear appearance in a dream. But most of the people simply followed their hearts, natural attraction, tradition of family and home town.

Choosing one “primary” Netjer doesn’t mean that you can’t have “many”. Historical example again: even the high priest of one temple could also have priestly ranks and offices in other temples, dedicated to other Netjeru. So, Egyptian priests could bear titles “high priest of NN, and priest of NN, and NN, and having a shift in the temple of NN”, and it totally worked.

While I identify as Pagan, and more specifically as Hellenistai, I also fall into the category generally defined as "devotional polytheist." For me, the Gods are at the center of my spiritual practice. I write poetry and short stories and essays in their honor, meditate and go on trance journeys, and endlessly discuss their natures and myths and influence upon the world. As such, theophanies -- manifestations of the Gods, personal encounters with them -- are of particular interest to me. I love to read of others' encounters with Gods and Goddesses and spirits of all sorts, from every tradition, new and old.

Additionally, not all theophanies are ... well ... I have found some passages in works of fiction to be as profoundly moving and insightful as any (nonfiction) work. It leads me to wonder if the authors have either coded their true encounters, changing bits here and there to include them in novels and short stories; or if the authors have some intuitive understanding of the Gods and spirits and the world beyond the mundane.

A Valentine for Your God (Written together with A.D. Kent)

"The whole thing is to love God
and to taste His sweetness.
He is sweetness and the devotee is its enjoyer.
The devotee drinks the sweet Bliss of God.
God is the lotus and the devotee the bee.
The devotee sips the honey of the lotus.

As a devotee cannot live without God,
so also God cannot live without His devotee.
Then the devotee becomes the sweetness,
and God its enjoyer.
The devotee becomes the lotus, and God the bee.
It is the Godhead that has become these two
in order to enjoy Its own Bliss."

—  Sri Ramakrishna, "The Sacred Jewels of Yoga"

St.Valentine's Day!
Ahh, it's the Secular Day of Love made popular by greeting card companies-- and the Feast of Saint Valentine, which has more significance if you're Catholic. Most people get through not having the traditional secular day of love “valentine” by ignoring the public displays of affection or out and out having an “anti-valentine” of some kind. Ie ask why expend that energy being negative? There's enough negative energy in the world already. If you have no other valentine you may do a variety of loving things for yourself-- or in devotion for your God. That's really what I want to talk about.

Divine Love. Love of the Divine. Bhakti.

https://en.wikipedia.org/wiki/Bhakti

There's the wikipage on it, so wiki away if need be, and then come back. If not then good, you're just that much ahead. The important thing is Love is an experience that grows-- sometimes faster, sometimes slower, depending on how you nurture it. If you even WANT to love your Goddess or God deeply, then probably you are already on the way of growing that love.

“Teach me how to love you”, “Let me love you more and more every day”.
These are absolutely legit wishes for you to present your deity and no one is pushed into that type of relationship with a deity-- (consent is a very big thing. A powerful thing.) If you want it, just ask for it. (If you don't, please make that clear too) Just ask for it in a prayer. Ask the deity to help you to “grow more in love” with them, and if that feeling between you is mutual, They will definitely help! You may notice the changes coming into your life, emotions and feelings that burst forth. These small changes will build into a sense of renewal and well-being.

As previously mentioned, my kindred is kicking around an idea for a shared ritual this July for Loki. Since people expressed an interest in this, I thought I'd post some simple ritual tech for this Working. We're keeping it simple, and using a variant on "Come to me in whatever form (or a specific form) and share with me whatever You choose."

ex: "Loki shapechanger, Loki Witchfather, Loki Mother of Monsters, come to me as You like; share with me whatever you please. Come to me in love, as I love You." (or honor, or other verbiage that suits your relationship with Him)

"Come to me in whatever form You want, and share with me whatever You choose."

It's almost July for Loki again, and because He is a Man of many faces, my kindred is talking about doing a ritual to ask Loki to show us a new face or facet of Himself - or Herself, as Lady Loki* has been the subject of much discussion lately. The main point, however, is to learn more about Loki. Lore is great and all, but people grow and change, and so do our Gods.