First off, Welcome to YT!
PLEASE research before you do anything! there is no such thing as a teacup. It is just a term used by breeders/brokers/pet shops to make more money. It is extreemly dangerous to breed a female under 5 pounds, and it is risking their life if someone decides to. Gina brought up good points in her post about that. You can still get small pups by breeding a small male with a standard sized female. Good luck.