I am not a breeder either, but I do remember when the code of practice on this site was set up, the breeders involved were all of the view that a bitch isn't mature enough to breed from until she is 2 years old.
Also, until she is fully mature you won't really know if her temperament is such that she is suitable for breeding from. For example even the prettiest bitch with excellent hip and elbow scores and good eyes is not really suitable for breeding if she turns out to be timid, or fearful etc.
The Labradoodle Puppy finder has a lot of information about health testing etc
http://www.labradoodlepuppyfinder.com/, and also about the information you need about your bitches parents and grandparents health scores and history.