Contact your breed club in your area about classes. You can go to AKC site and check the clubs in your area. Also check with Yorkshire terrier club America -
www.ytca.org They can also help. AKC also has a list of registered handlers, but make sure they specialize in yorkies, due to our grooming. I went to one show and knew this one handler did not know completly about our breed, since he placed the yorkie's tail up across its back while in the ring. Classes here cost either 8.00 a class as a drop in or 40 for 6 classes if a member of the local club. I do not know the rate for non-members.
Good luck!
T.