Do you have some sort of project in mind, or are you just trying to learn perl CGI programming (or both)?

How about trying "perldoc CGI"? Perl comes with a lot of built-in documentation. If you want to see it in a browser, go to this Perl documentation site

Have you looked at Lincoln Stein's CGI.pm Site

Can't say I fully recommend his CGI.pm book, however, though others may like it. In particular, the reference guide in the back of the book stinks. I'd like to give you a positive recommendation, but that's the only book I have on the subject. ;-)