I'm lost, need some help

Weeeell, I do not know a lot about it, but I'm trying to get to know! First off; I actually heard about daemons and paganism from my younger sister, I asked her to tell me more about it, since I found it really interesting, she told me I should do my own search; still, I do not know where to search, so I would be grateful for any advice or book/site/article recommendations if they are trustworthy I have some specific questions;

1 - how do I get to know the daemon I have the most compatibility with? 2 - how do I talk/communicate with then? 3 - how can I make a contract? 4 - how much daemons and other gods can affect the human realm? (This question may seem confusing, but what I mean is; how much they can do for humans? I do understand they are extremely powerful and all, but in my conception gods and daemons have limited access to the human world, like, probability things and restrictions, idk how to explain) 5 - which offerings can I give them? 6 - I kind of worship the Celt Goddess Brigitte and Greek God Ares, can I do a contract with them the same way? (I asked it cuz I read in the sub description about paganism, sorry if it was offensive...)

I wanted to ask more, but it would get too long, still, I feel like this community is really warm and accepting, so I felt comfortable to ask all this :)