Hi, I see you're new to YT. Welcome!
There is a yorkie for sale/wanted section on this forum where you can post in detail what you are looking to purchase in a yorkie and people can contact you.
Also, there is no such thing as a teacup yorkie. All yorkies should be to standard which means they are no bigger than 7 lbs. Some end up slightly bigger or smaller, and "breeders" call the smaller yorkies "teacups".
Most breeders that say they sell "teacup yorkies" are ones you want to stay away from.
Again, welcome to YT!!