You can try to find some Skirmish maps over here :
http://www.moddb.com/addons?filter=t...def&game=14503
To install : Extract the map into your "Mods" folder into your Men of War folder . If you do not have any "Mods" folder then just create one . Then go in game and then Options , select "Mods" and activate your map .
Some mods are playable with other mods but it's rare , you can try at your own risk .
Tigerium