[okiscopey (Mike)]

Originally Posted by Suzy

Yes that will help you plenty, I was going to post that here but Ron beat me to it. Here is a wikki link which explains it really well also.
http://en.wikipedia.org/wiki/Hertzsprung–Russell_diagram

... and there's a link at the bottom of that page that just might be what you're after:

http://en.wikipedia.org/wiki/Stellar_classification