there's no such thing as a "teacup" anything.
You first need to show both of your dogs and earn the Ch titles on them.
While you are showing, find an experienced breed mentor.. with the help of your mentor, research breeding, genetics, pedigrees, health issues, whelping, puppy raising, etc.
Save up money, you will need money for genetic health tests, stud fees, and most importantly, prenatal vet care.. yorkies often need cecarians, so you should have at LEAST $5,000 set aside for vet care before planning a litter.
Develop a good relationship with your vet.. you will need it when she's whelping at 3 am and a pup is stuck.
When the dogs are 2 years old, get their genetic health tests done thru the OFA, CERF, BAER and Optigen, as well as a brucellosis test.
With the help of your mentor, compile a waiting list of potential puppy buyers.
With the help of your mentor, you can now select suitable mates for your dogs. Your male and female may not be the best match for each other.. you will have to find mates that have traits which compliment your dog's faults.