For the Configuration file to put in the command line its quite simple really, Just take a copy of NWConfig.txt and edit it to how you like, new server name, server passwords ect, at the bottom change the units to
#adding all nations to both sides just to randomize all of them
#adding less nations will reduce the randomization set (used in set_randomize_factions command)
add_factions fac_britain fac_britain
add_factions fac_russia fac_russia
set_randomize_factions 1
This will just make sure only Britain and the Zulus come up!
After all this save it as say for example ZULUConfig.txt Upload this to your server and have your command line ready for launch like so:
-r ZULUConfig.txt -m The Anglo Zulu war
That's how I got it to work on my server
If you really need a config file I will upload one for you