Getting back to your original question, I don't think that having routine heart, lungs, bile acid, hearing, and eyes testing on parents and grandparents is enough. Reputable breeders do many tests (including extremely important gentic testing) on many generations back & study their lines in-depth to assure the health of their puppies & future breeding stock. They know exactly which dogs to breed together to achieve their overall goal of bettering the breed. It's a science.
I'm not educated enough on breeding to have an opinion about whether or not to breed every heat cycle. But these are types of questions that you should feel comfortable enough with your breeder to ask him/her. I'm a big believer in building a relationship with your breeder & getting to understand their philosophy. From there, you'll be able to find a great match. You should feel comfortable enough to let him/her know that this is your first breeder experience & that you might have a lot of questions about very basic things, even terminology. Don't be intimidated. A great breeder will be more than happy to answer all of your questions. I think that once you find someone you click with, the rest will be history
Good luck!!