
Firstly & most importantly, he has to have all the relevant health checks for the breed, some of which he can't have until he's 12 months old. Then you need to discover all about the dogs in his pedigree - were they all good examples of the breed, did they have any health problems etc etc. Then you have to find out if your dog is an excellent example of the breed.
If he gets that far & still seems suitable to use as a stud dog, you then have to convince someone that they should use your dog rather than someone else's and check all the above out for the bitch as well. If you find someone, you have to let them convince you that they are a responsible breeder & that your boys' offspring won't end up in a pet shop or a home where they are mistreated.
After all that, when you find the perfect partner for your boy, the owner will bring her round and your boy will take one look & say "I don't fancy THAT one bit!