As you've seen from your previous response, most likely your question will elicit VERY NEGATIVE responses (especially from the very people who do exactly what you'd like to do - breed).
You see, breeding is such a complex thing because it's more than simply having a litter of puppies.
What breeding is mostly - is a group of people taking an existing population of dogs and by ACTING TOGETHER they move the average of all dogs within that group in a certain direction.
Does that make sense to you?
So the very first thing you should probably do if you want to have a litter of pups is to think about what you would do to change the whole breed if you could do it single-handedly. Then try to find like minded people who have the same basic concept and desire at heart. Unfortunately with Yorkies the "groups" of people, working together are very few although there are many many people breeding.
Conformation show people (the ones you see at dog shows gaiting dogs around a ring) are one group who basically fit this description.
Unfortunately, instead of welcoming others who want to breed into the fold they are usually AGGRESSIVE and MEAN to people who express any interest in breeding. The reasons why don't matter. But, the way you posed your question, GUARANTEES that show people will be very mean to you. It would be best to avoid any show breeders until you know the things you have to say to make them think you're one of the "in" crowd (the only people to whom they show respect).
Usually, show folks have the dogs that most people think are the best dogs. So, that's a problem for someone like you when looking for an appropriate stud. But it isn't an unsurmountable obstacle.
My suggestions would be as follows.
Post questions like yours and ask people if they would like to be part of a private email ring., You could start a group of friends who want to start breeding Yorkies and do it outside of the "show circle" . Do not email back and forth with anyone like me, who is posting opinions, but rather only email with people who want to be part of a group breeding program.
Next: read, read, read about Yorkies, about Yorkie breeding etc....and talk, talk, talk with these people about what you would like to be your contribution to the breed as a whole.
Read about dogs in general. Read about dog training. Read about the latest philosophies in diet and nutrition for dogs. Read about basic genetics (this is usually very interesting and doesn't have to be boring).
Remember, your litters won't exist in a vacuum! They will be part of the Yorkie population as a whole! SO, HAVE A PURPOSE.
Example: Perhaps you feel that there is too much variation all around within the breed and you would hope to eliminate some of that wide variation by breeding for the golden middle. Perhaps you feel that while HAIR is the first thing most people think of when they think Yorkie - you rarely see pet Yorkies with gorgeous floor length coats. Maybe you'd like to pursue breeding dogs capable of growing coat without extensive coat protection like wrapping. Some Yorkies can grow coat without wrapping. Most can't. Maybe you'd like to be part of a group that makes a dent in that situation.
You see what I'm getting at.
Develop a broader goal than just having puppies.
Even if that goal is just making sure your puppies look like Yorkies should look and have fewer health problems than Yorkies as a whole have. (There is a LONG list of problems associated with the breed.)
Also, find out what mistakes people have been making and try to avoid them. For instance for many years most breeders praticed inbreeding that they liked to call by a different name. That name is linebreeding. Within the last ten years there has been a radical change among the enlightened and whole groups of informed breeders are trying to avoid linebreeding in an attempt to keep the COI (coefficiency of inbreeding) very low in order to avoid the pitfalls in health that high COI translates to. (This is a complicated subject.)
Breeding dogs can be the most fascinating hobby on earth. But one must understand that it is a group effort - not an individual sport.
