I found these pages byYTCA.org while I was researching on how to groom a yorkie. This is my favorite website for yorkie-grooming guide. It's quite informative and even has diagrams to tell you specifically which blades to use. Best of all, there are also pictures for each step. (This is very helpful for me since I'm more of a visual person when it comes to stuff like this .. hehe.. )
I printed the pages out and kept in my library so that I can try on Cocoa when he gets older. (Right now he still has the normal puppy cut ...)
Here's the link:
http://www.ytca.org/grooming_clips1.html
Hope this is helpful.