Find out what your squad is best at...
But I'm guessing from the warlord's forum, its going to be a 4 vs 4. So Squad rush is probably going to be game mode.
If you're going to do a clan match... I suggest doing around two rounds
First Round: 13th attacking vs opposing defending
Second Round: opposing attacking vs 13th defending
You can extend it to further maps if there is a draw.