There are many examples and tutorials out there on the web. Here, look in the Tutorials section. Another place for code help is WebMonkey, and there are lots of others. Search for "Perl CGI" to start.

CGI is an old protocol, and the Web now has many other methodologies for server-side programming. However, many people still use it, and it's perfectly adequate for the majority of websites out there.

Good luck, Evilsid. There is much to be learned here, and it is obvious that you're starting from the very beginning. Take time to search through the material that's already on PerlMonks before you ask such big questions, and do your best to try before you ask. You'll get much more assistance and support if you try to push your own wagon before you ask for help. :D