I paid $150 for my German Shepherd. I need advise on breeding?

I was wondering how you get all these dogs. My GSD is an American Bred. From what I have read you do not particularly like that breed but Tonka is beautiful; he's not quite two, he still has about eight months to go, anyway I paid $150.00 for him and would like to breed him, but I can't seem to find the right female for him. Tonka is a very smart dog, it doesn't take him long to pick up on things. It's very hard to keep him focused because he's always looking for a new adventure. Some people say he looks mean well if you look into his eyes he does but he isn't mean. I just need to know how to breed him, how to tell a good female from a bad female, and how to do dog shows, (if he can handle them.)

Thanks for your help,
Lindsay