hi doc,
photoshop's a great tool for special effects and all. But hm... maybe if you'de like to use illustrator which happens to be a little easier if you happen to be a beginner. It works fine for me when i was just learner. But well, hope this link helps:-
http://www.allgraphicdesign.com/
Here's a link for photoshop tutorials ( hope this helps you out!)
http://www.graphic-design.com
Basically, my advice is to be a little experimental with it. Just like any layout, only in a CD cover form! =) and Plese don't forget the important details : band name, album name etc..
be creative! you're a doctor! GOOD LUCK! =)