in the lobby, host a multiplayer game, and set a password, if you do not want other players which are online to join zour game. for a start, i recommend playing the mod BA, as you have the widest range of AIs to choose from with this mod.
when you have opened/hosted your game, you can click on the "Add Bot" button, and then choose KAIK, or if that does not work, use RAI.
then you maz do other settings, but this should be enough to start your first game.
if you have problems come back here again, and if the game crashes, go to your spring fodler, open infolog.txt, Ctrl-A, Ctrl-C, then go to
www.pastebin.com and Ctrl-V, enter, and post the link here.