This commandline above would be executing the mods/mymod fsgame folder and server.cfg located in it to start a mod +set dedicated 2 +set net_ip xx. +set sv_maxclients 16 +set net_port 28960 +set fs_game mods/mymod +exec server.cfg +map_rotate Thats either up to you to set your command line correctly or your server rental company to do it for you but either way its very important to be correct. No map iwds in your mod folders only the mod.iwd itself from the mod you are using and the mod.ff along with the cfgs needed to start your server.Of course a correct server commandline is needed to execute the proper mod folder and the proper server start up cfg. So in your mod folder would be a mod.ff ,mod.iwd. In your mod folder and inside the folder you named for your new mod would include the mod.iwd and the mod.ff thats included with the mod and all server configs needed to start your mod.
Your server should have a cod4 folder and inside that a mods folder and inside that a folder named the name of your mod or ect. For mods say you are using Extreme X4 2.0 for instance it doesnt matter which mod most all mods would be installed the same way as Extreme X4 2.0