You can sign up at this site to receive FREE mini training courses relating to yorkies. They will send you emails describing how to house-break your yorkie, crate train, teach basic commands, prevent barking and biting and more.
Of course like everything that is free- there is a catch... they really want you to buy their book. So there is a lot of advertising also.
I did sign up and have received the first training course via email... according to this one, I will receive several more in the next few days. So far it seems fine, I am really looking forward to the one on BARKING!
If you are interested- check it out.
http://www.yorkshireterrierinstitute.com/index.php?p=m