I suggest a good book on Perl, of which there are several, at all levels. Take a look at O'Reilly's "Programming Perl" and "CGI Programming." If they're not too advanced, they are the ones to get.
The Perl book will tell you how to get it for Windows. Or, 5 min. with a Google search will lead to you to it.
You could start at
www.perl.com.