[Ellie May]

I wouldn't breed a CKC registered Yorkie. I would stick with AKC.
You would have to put a lot of money into testing before breeding.
What if the puppies aren't selling? Can you keep them if the bitch's owner can't?
Very few reputable breeders would use someone else's stud. You will be dealing with inexperienced Yorkie owners who just want some cute puppies all the time. Can you handle that? You would have to tell some owners no if their females are off standard (if you are breeding to standard).
You would have to house and care for the female for a week so you may be liable for anything that goes wrong.
Would you be available if the bitch's owner needs help (constant calls if they're inexperienced)?

So, I'm not trying to totally discourage you from breeding but please just make sure it is what you want first. I would discourage anyone from breeding a CKC dog though... I just don't see how they're strict enough with registries.