In a word , Research. There really isn't any bad questions to ask a breeder when buying a new pup. I 'd be wary about someone "taken aback" when posing a question ,especially about , eyes, elbows and hips. A good breeder is going to welcome any and all questions and will have a few for you also in trying to find a pup that will fit you.
Look for a breeder that breeds a dog for your style of hunting and lifestyle. IMHO this is the single most important thing one can do. One doesn't need a high octain field trial dog for hunting that will be bounceing off walls in your home when you want it to be a nice foot warmer when not in the field.