Welcome to Perl, but you should quickly be told that using PERL is frowned upon. The language is "Perl" and the interpreter is "perl". Never PERL.

For your purposes I recommend The Perl Cookbook, also from O'Reilly. However, nothing beats writing an application for your own use. Perl is huge and can be used for almost anything. You probably don't need to know all of Perl, concentrate on the areas that will help you most with your job.