I am so so sorry that you bought your dogs with the intention of breeding and ended up with something that you didn't expect. I am sure you must be so frustrated and disapionted. I hope that you will be able to look back on this later and see that it was a great opportunity to learn. You must have a love for the breed, seeing that you were looking to start a breeding program. And I am sure that you want to produce yorkies that are good quality and look and act like yorkies.
I would suggest doing lots of research, this is a difficult breed to "get right" you can put any two dogs together and have puppies but if you don't know what lines your breeding from and how they grow and if they should be paired together at all, you can end up with any number of uncertainties, such as major health problems(LS is a huge one in this breed) or dogs that grow too large, the list could go on and on.
When you are buying a puppy your are also paying for the breeder, keep this in mind when you purchase your next one. You are paying for their time and effort, their knowlege and their quality. Make sure your breeder is one that will guide you through your first litters. If you feel a person is untrustworthy or lacking the knowlege of their lines or breed then don't purchase them
They should be just as careful when selling open reg to you, as you are spending your hard earned money and trusting someone again.
I am not a breeder but have done alot of reasearch since I bought my first yorkie. He came from someone who put 2 cute dogs together to make "Pets" and now he is a cute little dog with big health problems.