Their are different opinions on how the city is built. In the very beginning they have you build a Nightclub. I build it at first and destroy it when they give you a raze. In my opinion it's pointless. I replace it with a house. I have a total of 6 houses and 14 Barracks. you will do most of your big training in your outpost. And of course 1 of every other building they have you build.