In the book "Perl Cookbook", chapter 17 on Sockets would be of great help to you in this project. You are going to need either the 'IO::Socket' module (easier) or the 'Socket' module (for more control).

Also, you need to figure out if you want this mini-server to use forked processes, what protocol you are going to use (e.g. TCP, UDP), and whether it will run as a daemon. Good luck, there is more to this than meets the eye. ;-)