@muddy75 - I highly recommend
The Ultimate Guide to Skinning and Tanning my Monte Burch. That's how I got started, and combined it with alot of personal trial and error and recently picked up more books and info. I keep notes as I go along too. To be honest, methods vary across the board so I can write some of what I do but you'll find all sorts of people doing it different ways. I picked up another book about braintanning to buckskin (can't remember who by) and they go in great detail about the sort of science behind tanning and it's been insightful. I guess I should ask - are you looking to tan hair-on hides, or hair off (leather)? Are you looking to make clothes/moccasins for the outdoors or crafts that won't see weathering? It'll help me get an idea of what to recommend.
I started off tanning squirrel and rabbit to start with practice. Rabbit has thin skin so it teaches you to take your time fleshing and stretching.