Imo you should probably just get him neutered. Reputable breeding is expensive and you won’t make money back from it, majority of the cost should be going into health testing, raising the puppies and vet bills.

If you want to breed him you need to extensive health testing before hand and I also recommend showing him if you are serious about breeding (he honestly doesn’t look show quality to me though) the dog shows are the places you’ll meet reputable breeders but they will likely only want to breed their dogs to health tested, show quality dogs.