How do I make money to my base?
You make money by using the natural resources around your base. An example is building oil pumps. The oil pump make you pump up and sell valuable oil.
To make money with the black gold you have to have a building that can refine the resource and make it sellable. You will need a refinery to sell the oil and get money in exchange.
When the refinery is built, click on it and select the amount of oil youd like to sell. You have to have a smallest amount of oil to be able to sell. If you do not have enough oil to start selling, just wait for the pumps to pump more oil up. You can see the amount of oil in your silos by looking to the left after pressing the base symbol.