If I want to adopt my cousin...what do I do?

I live in the same state, Arizona. We want to move OUT of AZ within a year. It's not that "I Want" but I feel she needs something in which I feel i can provide. I DO WANT her to be safe & healthy & happy. I have not talked to any family yet because I wasn't even sure if it was POSSIBLE. Personally, I have no evidence. I have what his mother is relaying to me & I DID see the child had no bed.