I would suggest you get all your genetic testing done before you offer stud services. Most people (people who actually care what the results of the breeding will be, as in the puppies) providing the bitch would not want the stud service unless all the genetic tests are run for that specific breed. OFA and CERF are a good place to start, along with any other genetic diseases that are carried in that breed.
Do the genetic testing (the minimum age for the testing is 2 years old) and see the results, then decide if you want to offer the stud service.
I would also hope you screen the bitches before you offer the stud service, make sure that they have had all the genetic testing done also. I would not suggest breeding to any bitch who has not had her genetic testing done.