There are a few missions over at the Battlefront web site... checkout this area.
Battlefront.com Discussion Forums » T-72: Balkans on Fire! » T-72: Balkans on Fire! » User missions
Link:
http://www.battlefront.com/index.htm
Also with the mission editor you can remake the mission already with the game and save them for later use. The mission editor has no manuel though... so it's trail and error learning.
Good Luck... hope this helps you out... I really think the game is pretty good. But one draw is lack of support.