I found the following useful:
Code Check: Plumbing
Black & Decker: Complete Guide to Home Plumbing
Stanley: Complete Plumbing
All were easy to understand, but detailed enough to get you to 2nd base.
Once there, you won't find a better reference than this forum for helping you through specific situations. However, lurk for a while to find out who's advice you can trust. There are a lot of frequent posters here (myself included) whom I wouldn't trust for serious advice.