There are five types of buildings:
Barracks: Train troops
Airfield: Build planes, helicopters
Docks: Build boats
Factory: Build Tanks, Jeeps, and Mechs
Silo: Build missiles and Shuttles
Two types of towns:
Base: Store and train troops
Capitol: Build, train, and store troops, land and air vehicles, as well as shuttles
And two fortifications:
Turrets: Either manned or with AI
Walls: Stops land and sea from getting in
You start with only a barracks and nothing else.
Also, no starting on the mainland.
Don't worry about my green place, I am not aggressive in these types of games.
You can join anywhere not taken or on the mainland.