OP, if you do, indeed, end up getting this, the only thing you'll want to get in addition would be a multimeter.I started writing up my list of suggested parts and beginning experiments until I browsed that link to the Radio Shack Electronics Learning Lab, and saw that it includes everything I was going to suggest, and more.
Go for it - get that lab and its lesson manuals, and work through them. You'll learn the basics, and you'll have an experimenter board that you'll use for years.