WHM? As in cPanel? Bleh, cPanel is a pos.
What server you running? Assuming it's cPanel, gotta be a Linux based system. Apache web server with ovbiously Perl (you're running CGI scripts). PHP? If it's cPanel, you're most likely on PHP4 since as a month ago cPanel wasn't compatable with PHP5. And no doubt MySQL. Who doesn't run that? ha.
Running a server is simple. Just take each piece as a piece of in itself. Don't try to clump everything as one as the cPanel loves to do. Get a book on Apache and read about it's configuration files. httpd.apache.org will be your best friend when you're just getting to know things. I assume you already know about dev.mysql.com. For perl there's cpan.org and
www.perlmonks.com (I love perl monks). And that's all the links I can think of off the top of my head...
As long as you have direct SSH access to the box and at least sudo privliages, I'd suggest dropping cPanel.
Personally, I dispise cPanel. But that's just my opinion.
