Within the immediate vicinity of the yard you can now begin expanding your camp. First you need to construct a power plant to provide electricity to your buildings. Next you require an ore refinery which sends out a truck to collect valuable minerals - these precious stones bring in the money to finance your construction. Barracks allow troops to be trained. War Factories produce tanks, rocket launchers, artillery.
Naval bases provide ships and subs.
Airfield planes and choppers etc. Obviously once your base is established you will need to protect your investment. For this purpose there are various forms of immovable weapons and structures that may be placed around your base such as gun turrets, tesla coils, mine fields, concrete walls and wire fencing. At any time the enemy may wage an attack on your base and you won't have a clue when this is about to happen. This is because all of the terrain that has not been crossed by your troops is completely blacked out.