Well, first, you need to set a goal. Do you want people to have big 4-plot houses? Or 1-plot houses? Myself, I chose 1-plot. Next, you need to pick a road size, 2 and 4 work well. If you pick 2, a 1-block outline of each plot needs to be made, if you pick 4, its a 2-block outline. After that, set some rules, like: "No messing with roads" "No placing items on roads" "No deleting roads" "No building on roads" Then, you need to set a punishment for them, and then, enforce it! Thats all up to you, though. Tip: Make a small area in Creative Mode, if you like it, go with it!