Sage wisdom from Doc E. The more your expectations for the dog the more it holds true. Don't try to "save" a few hundred on a dog, buy the best pedigree you can find. What to look OFA, CNM,and CERT in BOTH parents. Look for FIELD titles in the pedigree. Beware, "Champions" are commonly advertised and have titles such as CH (Bench Champion), if you want a good dog avoid them like polio. They'll claim they are "great hunting dogs" best thing since Lean Mac. What youARE looking in the pedigree are MH, QAA, AFC, FC, NFC. The more the better.
As for training material thereare Evan Graham's "Smartwork" series, Lardy's Vol I, (II, and III are much more advance). There are some decent books, but I would follow a complete program with flow charts like the Lardy or Graham. DVDs such as Jackie Merten's "Sound Beginnings" for the early training. There are video's on FF and CC. Seek out a local retriever club would be highly recommended. There are a couple of other sites that are retriever specific.
www.refugeforums.com (Dog Forum) and
www.retrievertraining.net