I suggest for a map that you'll create a small pangaea map with no islands off the coast, and the different communities very close to each other with few natural barriers (only some rivers and mountain ranges to help divide territory). This has to be done in order to create a constant ambiance of war and thus promoting activity and productivity ^^
Question how many communities are there? And is the world gonna have buildings built by builders where you can live in or do you and your community members have to build your house by yourself?