Well, I can't really teach you Perl over the net ;) , but for WWW automation, that's the main module; see also the links on that page.

For Perl generally
http://perldoc.perl.org/ - describes the complete lang with examples and tutorials
http://www.tizag.com/perlT/index.php - Perl intro/tutorial
http://www.perlmonks.org/?node=Tutorials - tutorials(!) from the Perl Monks site, which is where the Perl gurus hang out.