in reply to What are Modules

I think the first thing you need to learn is how to use the documentation that comes with Perl: try the following:

perldoc

Which leads you to:

perldoc perldoc

Which should lead you to:

perldoc -q module

and to:

perldoc perlmod

Note that man perl would also lead you to this information and that on Windows Active Perl also comes with the doc.

Of course you can also use the Search on this site, but this should get you started!