Welcome to YT!
There are a number of folks who can give you more information about breeders in your area. I personally feel strongly that you buy (select) your breeder first, then get your puppy. Pay attention to the health guarantee that the breeder gives. You will find a lot of personal opinions when it comes to selecting breeders and puppies. Such as, I like to purchase from breeders who show dogs.
The Yorkshire Terrier Club of America (YTCA) has a list of approved members/breeders you can look at.
Take your time - don't be in a hurry - this pup will be in your life for 12 to 15 years so you want a healthy and happy pup!
Good luck. We will be eager to see pics of your pup when you get one. Keep asking questions
PS - incase no one has told you - be sure the breeder keeps the pup with its mother until at least 12 weeks.