I applaud you for doing your research. There are a lot of knowledgeable and helpful breeders here. I think some of the best research you could do is to read through their posts, ask questions, LISTEN to the answers, and find a reputable breeder to learn from before you even think about beginning. I read a really good post earlier tonight, I'll try to find it and post the link.
Here's the link. As a non-breeder I thought this was one of the clearest and most concise descriptions I have read about why you should do your research and breed for the improvement of the breed that I have ever come across. Good luck.
http://www.yorkietalk.com/forums/sho...5&postcount=19