You can worship as many as you like. Offer them what you can or will, they are gods so it really won't matter, pray to them. The concept of who "made souls" to you is a tricky topic and will be up to you to decide based of your beliefs. Anu has many daughters as the mother of the tuatha. My suggestion for a goddess is the morrigan, goddess of death and dedestruction, represented by crows.
You don't have to limit yourself to one specific pantheon. Though, you do have to be careful of which pantheon you practice with. Some Gods and Goddesses clash with another. Just like Greek vs. Norse. Greeks see themselves higher than all Gods (I use that as a cliche example), so Zeus would clash with another God who thinks He is higher (Odin), and "king", those two would clash. I've worked with Norse and Greek Gods together, and they need "space".
Choosing deities to work with is a constant and continuous decision. Choosing one deity doesn't mean that you have to stick with Them for the rest of your working days. It's all up to you and what you want to do.
You can worship as many as you like. Try to go for ones you feel connected to as it makes the relationship mean more. As for the how to worship them, set up an altar and have images of them and items they are known to be found of. This means doing some research. Look up old myths about the deities and about the temples that were dedicated to them if they had one. Learn as much as you can about them.
For example, Brigid is known for being associated with fire and the hearth. You might light candles when you pray to her because of this. And since Imbolc is generally associated with her, that would be a good time to honor her.
Look into each deity in this manner. Write out notes and then figure out your own way to worship that suits your life and their known associations.
When I began the Pagan path I already knew which deities I wished to work alongside. This is because as a child, since I was in Elementary school, I've always had a fascination with Mythologies. I've studied various cultures and their mythologies, but I have been compelled to further my education in Greek, Egyptian and Celtic.
So when it was time to select my deities, I used my prior gathered knowledge to make my decision. I have chosen to honor four Goddesses: Demeter, Persephone, Nyx and Selene. I only acknowledge one God: Hades.
In my opinion, work with whomever you feel the most comfortable with. I don't consider the deities as actual beings, but personifications of the fantastical forces of nature. So for me, I use their names, but not actually addressing the deities that have been worshiped. Everyone has their own path, discover your own. Best of luck. Blessings.
Anu, also known as Danu, is said to be the mother of the Tuatha de Danann. More specifically she is seen as the mother of the Daghda and possibly of Brigid.
I would do some thorough research on your Deities before you start to pray and honour them. As for the Deity that made your soul, that is a personal question for you. For instance i believe that all Deities are one and so technically i am a child to 'all' Deities. It just depends on what you believe and what feels right to you.
There are many Deities to choose from and no one can realy help with choosing one for you. I would recommend researching about different Deities, especially if you feel drawn to a specific Deity.
I hope this helped, but the most helpful thing to have on your side is Faith, Trust and Knowledge.
Blessed Be.
