Game Replays do mapping competitions so you might want to check their forums as they do have advice/help around. Just visit there GR - COH - World Builder and Modding section
Last mapping competition winners were (note these were built more for competitive play):
1v1 (and overall):
Engletons
2v2:
Alsace Moselle
3v3:
Veules-les-roses
4v4:
Vernichtungslager
These maps may be added by Relic to the map rotation when the next patch arrives.
Porta and Speedy both (from CG) have experience making mod maps, not sure how often they are around these days.
There is also Eastern Fronts which includes new factions/doctrines/abilities.
Europe in Ruins is another popular one among good players as is its competitor OMG - Operation Market Garden
Gamestah started covering a number of the OMG doing shoutcasts for them also, which you can find HERE
Cheat Mod is also popular among new players. Basically its unlimitted build times, units etc.
I dont mod maps but if your up for a game let me know, add me on Xfire 0s0k01.



