Hi and welcome to YT
. I hope you find some answers, feedback, and educational material here...if you look around, you'll find a ton of stuff.
I understand your hesitation - some of the most heated threads here have to do w/ unethical / unscrupulous breeders and breeding practices. Given how much the yorkie breed has been unethically bred - you can probably understand why/how passions can run very high on this subject.
My best advice to you is that you look around, read the threads here - and first and foremost, find out *why* this is a sensitive and very important subject. With that background in hand, your subsequent questions will be informed, intelligent, sensitive, and insightful....they couldn't help but be that if you truly look around and are willing to learn.
Starting places are, of course, this section itself -- but also see these 2 sections of the YT Library:
Breeding and Breed-Specific Library - YorkieTalk.com Forums - Yorkshire Terrier Community Puppy Care and Puppy Info Library - YorkieTalk.com Forums - Yorkshire Terrier Community