Where can I find info about the Fey? [5e]

Im looking at multiclassing my halfling bard into warlock, and I love the theme of the fey, so im going to make a pact with an archfey. Problem is, I cant find info on the fey almost anywhere. I dont even know if i want to make a pact with a seelie or unseelie fey, because i cant find much on them. As I understand it, Seelie can be Generalized as "good" and Unseelie as "evil", although this is a gross oversimplification. Is there a book I can read to find out more about the fey? particularly an archfey with a close connection to animals? Any help is appreciated!