I think you should learn Photoshop tools first.. then you can start learning from tutorials like "psdtuts" this website will help. one more thing try tutorials like icons, some effects using filters this will help you learning tools.
I may need somthing like this! I've done a poor man's copyright on all the drawings I posted on my page! Through the U.S government post office I may need your help when I'm ready to start my coffee shop can you friend me?