To change the player number you obviously need to edit the config file...
(the .cfg!)
to edit the map rotation, make a copy of the 'default' map rotation file and then edit it, or set up a map rotation ingame, export it, and enter the name of that instead of 'default' in the command...
And in that map rotation file, you reference game mode files, which you also can create by making copies of existing ones or by setting it up ingame (Private Match, there you can set them up and export them etc).
It's all not that hard.