Hmmmm.
Well, now, we do need new breeders. Breeders who want to learn as much as possible about the breed, have excellent character, and high standards for breeding stock. Without them, in a few short years the breed will degenerate to nothing special.
Unfortunately, wanting to breed your dog one time to get a puppy out of him, does not put you into this category.
Your dog can be a champion, dual champion, service dog, or anything else, and the answer is the same. Going into breeding for one litter/puppy is just not good enough.
If you are serious about using our dog for a stud, you have to get him known. You have to go out and get to know bitch owners. More importantly, you have to find bitches that are strong where your dog is weak, and have weaknesses that your dog has a chance of improving.
The only way to do this is to move out into the GSD community. Go to a training club, schutzhund club, breed club, go to events, enter your dog, get paperwork on him (and don't lose it). Spend a year or more working to learn everything there is to learn about the breed and breeding. Meet people. Get involved in everything. Get to know the dogs too.
The good news is that there is no hurry. Your dog can wait years before being used as a stud.
Also learn about the mechanics of breeding. If you let your dog mate with the bitch on the next street, and you do not muzzle her and she is not held, she can easily nail him and make him hestitant instead of confident when it comes to breeding. Which will make him useless.
There is a lot to this. You need to learn the ins and the outs if you want to be responsible about this. The hope of course is that you will learn enough to let the people who are in it for the long haul do the breeding, and you will enjoy your pet and possibly do some good for the canine community as well.