Not much I can add. You have already received great advice from reputable sources. I hope you take the time to read and learn about all the topics mentioned, and you search out a great mentor. If you do a quick search on Yorkietalk, you will see how many people encounter problems when trying to breed yorkies. This isn't the place to go to when a pup is stuck during the birthing process, (for example) that is something you and your mentor should handle together among other problems that may arise. It's not just about "I have a female, you have a male. Let's put them together and make puppies!"
Good luck! and Welcome to YT.
