Well, I know Vampothika did a tutorial a while ago, but not sure of how to get to it. You can try this, I don't know how old it is though. Most people just learn by trial and error (with the error part not being any fun at all), create a .wba often and put it in a separate folder.
https://www.stardock.com/products/skinstudio/help/toc.htm
Thanks for the comments everyone! 
