Here are 11 Single player mission maps setup to be played in skirmish or multi-player (all the maps to hold 8 players).
I have also set up the numbering position in the high controversial JOE (me) style. Which means auto-team will not work! But you can easily play 1 vs 1 or 2 vs 2, at either end of the map (not right next to each other!).
When you run the installer you will be given 2 options to set the maps up as a mod. So that you will have to activate the mod in order to play the maps. This is a good idea for online because you will be able to see the other players wanting to play those maps.
Setup directly into the Dawn of War directory. Which is the traditional map setup and can be played with other mods active. Installer has instruction on the differences.