Information on creating a server can be found in
this thread.
Gamesnet also supports ChanServ I believe, it's the second largest network that does. There are other channel services on Undernet and Quakenet though, just a bit harder to register if you haven't got very many people. Further info on channel registration and maintenance can be found in the above thread.
If you have an eggdrop bot or a registered channel, channel takeovers shouldn't be much of an issue.
Regards,
