I would suggest going to the dog shows in your area and watch the yorkie ring - be sure to get a catalog when you get there. The catalog will have all the dogs competing and what time and ring # the yorkies will be in for that weekend. Then while watching - make notes in your catalog of which dogs you liked and why. This will give you and idea of the ones you liked the best and who the breeder is. Also mark down who won. You can also check the results by checking back the group that sponcered the show. They always post the results - this way you can check other shows and their winners. But! It is best to see the dogs in person!
I would also learn all you can about the standard - research, research, research. Do your homework! Then find a mentor in your area, join your local dog club and watch and listen.
You will find your baby, but do not rush into it.
Female show prospects are hard to come by - so it might take awhile. And most reputable show breeders are just not going to hand out their show babies to anyone. It is a huge investment for them and they need to trust the one they sell to - to make sure they know how to show and will do well with their dog.
Best of luck!
T.