Check out this tutorial for getting started with Photoshop. Click Here for the source files to work with the same files the instructor is using.
How to Get Started with Photoshop CS6: In this episode of the Adobe Creative Suite Podcast, Terry White shows you How to Get Started With Adobe Photoshop CS6. See how to do the 10 things that beginners ask how to do the most including how to remove the background from an image and put it on a different background.