Here is an example how you write a perl script that moves itself into the background (might not work on windows...):

!/usr/bin/perl
use strict;
use warnings;

my $ret_val = fork();
if (! defined $ret_val){
    die "Can't fork(): $!";
} elsif ($ret_val == 0){
    # do your daemon tasks here
    sleep 5;
    print "Exiting\n";
} else {
    exit 0;
}
[download]

As for the server you should check the Net::Server module.