If you think you have a very strong connection to any god or goddess you could meditate on it, and also exemplify the characteristics of said god/goddess. I hope you pick wisely..
I do have a sense of respect for you for showing an interest in the 'old' gods and goddesses, they are much more likeable in a way and more inclusive than any monotheism.
I wouldn't concern over being an incarnation of anyone, as you exist now.. what person we were previously is not important, only what we possibly carried with us. I do believe there are many gods and goddesses, but they are not literal 'creators' or anything, just very powerful beings who are like us subject to death and rebirth.