I found Adorama to have really good pricing but some people seem to not be such a fan of them. As far as chemistry goes, you can get fancy with it but since you're learning and all, dektol for developer, adorama or freestyle house brand fix and stop, and D76 for film developing. Basically the cheapest offerings, as they are the easiest/most straight forward to use. Medium format is great, and 35mm is always a blast since it is so compact and lightweight and still gives decent image quality. I've fallen head over heals for 4x5, but of course started with 35mm. Nikon's are great! I have an old F2 that this drunk guy gave me once, it's a great little camera! Feel free to send me a private message or email anytime, I'm always available for any additional questions you might have.