As you are a new to 'photoshop' can I suggest that you look at a cd called 'getting started with photoshop' by digital photo magazine.
It goes through most of the tools in depth, together with 'understanding selections', 'understanding layers', 'removing red-eye', 'multi image presentations', etc. It's like having lessons on a one to one basis. I think it's about £20. I wished it had been out when I studied photoshop at college. It would have saved me taking many hours of notes and then I would have had much more time to listen to the tutor. If I was you I would get the cd and let the experts teach you.
Hope this helps.