Or you could attend a dog show or yorkie Specialty would be the better way to go to actually learn about yorkies, breed standard, why they should be shown to championships that sort of thing. There is a lot of info on the Yorkshire Terrier Club of America website at
Yorkshire Terrier Club of America including where and when specialties are.
Are you wanting to actually contribute to the betterment of the breed or just breed dogs because. That is an important question to ask yourself, IMHO.