There is so much great information on this website under "Puppies for Sale" and the "More" pages. You will find things like what is Poisonous to Dogs and Puppies, How to Crate & Potty Train your new puppy, what is Hip Dysplasia, whether to purchase a Male or a Female, why buy from a Reputable Breeder and so much more.
The following books are specific to raising and training German Shepherds however, they will benefit anyone looking to understand their puppy / dog and their training. Recommended Reading:
How to Be Your Dogs Best Friend ~ A Training Manual for Dog Owners By The Monks of Newskeet
The Art of Raising A Puppy By The Monks of Newskeet