If you want to build this, you need to learn php and mysql. (I really wouldn't bother with cgi.) It's a major commitment. A good introductory PHP self-teach book is Larry Ullman's "PHP and mysql for dynamic websites">

Actually, if you can make it through Ullman's and actually learn the material, you'll be able to do what you want.

The other option is a cms system like Joomla.