This Should help you in setting up your server [Source=Post from STaTiC in Forums]:
First
http://www.wormsworld.net has all of the information... and helpful forums - Bulletworm is the cretor of PAM4 and that is his site.
Each release of PAM4 he adds rulesets for ladders we missed the cutoff so I modified the existing SD PAM4 lan.gsc file.
IF YOU HAVE THE LATEST RELEASE OF PAM4 ON YOUR SERVER>>>
Download theRumble REVISED lan.gsc file here>>>
http://www.therumble.com/index.php?code=therumble&rumble=downloads.phpUpload the lan.gsc file to your server
Go to your server and locate your mods/pam4 folder and open the z_server_pam400.iwd file using Winrar >> http:www.rarlab.com
Go to pam/rules/sd folder and click the "add" button on the winrar utlity and add the lan.gsc file you uploaded to the server.
Restart the server.
Now when you go into game and enable the PAM4 mod you can type /rcon pam_mode lan and it will load theRumble Match Settings
If it does not load> make sure you have set SD as the gametype in you server.cfg file on your server.
IF YOU DO NOT HAVE THE LATEST RELEASE OF PAM4 ON YOUR SERVER>>>>
Download theRumble Version of PAM400_FINAL here>>>>
http://www.therumble.com/index.php?code=therumble&rumble=downloads.php------------
1. On the server, make a new folder in the Mods folder (located in the CoD4 root) and name it pam4. Your new folder should be in the same folder that contains the 'ModWarefare' folder.
2. Upload the .iwd and .ff files in the download to the new pam4 folder on the server.
3. Set the fs_game dvar in the command line of your server to "mods/pam4"
4. Restart the server.
Go to pam/rules/sd folder and click the "add" button on the winrar utlity and add the lan.gsc file you uploaded to the server.
Now when you go into game and enable the PAM4 mod you can type /rcon pam_mode lan and it will load theRumble Match Settings