Hi, Welcome to Yorkietalk, May I suggest you read the "sticky" at the top of discussions page called Yorkshire Terriers Frequently Asked questions.
http://www.yorkietalk.com/forums/showthread.php?t=6016 It will give you an overview of the breed and things you need to know about breeders, supplies and training. In addition there is separate forums for further discussion on in these topics.
http://www.yorkietalk.com/forums/index.php I use the search engine frequently, and I have found it very useful in gathering information needed quickly.
I agree with the above poster who said that Yorkies need companionship. I think it's hard for them to handle being left for more than 4 hours a day. I know lots of people do it, but they usually get another dog to keep them company.