Welcome to Yorkie Talk! Good luck on your puppy search
The link Lisa suggested is a great place to start. You may also want to look into going to some dog shows in your area and speaking with some breeders there. They usually have wonderful recommendations and advice. We have some great breeders here as well. Just make sure you don't talk to them until AFTER they're done showing their dogs
-- also if you check with your local vet's office sometimes they have more information than you would believe. Hope this is somewhat helpful!