You can run this like all other game modes "out of the box" by selecting it from the Unreal game menu. But note that the fixed game modes look just like the normal ones, so unless you start them you won't know which one it is (press F1 during game to find out).
To run a dedicated server in batch mode, these would be your command lines:
Unreal.exe [startmap].unr?game=[GameClass] -server
or
ucc.exe server [startmap].unr?game=[GameClass] -server
Replace [startmap]
with whatever map you want the server
to launch first.
[GameClass]
can be any of these:
UTeamFix.DeathMatchGameFix
for the normal DM modeUTeamFix.TeamGameFix for team game
Make damn sure you make no typing mistakes or your server won't start! Oh... and were you looking for King Of The Hill or DarkMatch here? Have a look at the mutators page.
Last but not least, don't forget to add your own parameters, like which ini file to use, mutators to add etc... here's what one of my testservers is started with:
Unreal.exe dmelsinore?game=UTeamFix.TeamGameFix?mutator=testmutator.crapmaker?log=server1.log ini=Unreal1.ini -server