Connor is in financial trouble and there is nothing that he can do about it. He got a call from someone, he doesn't know, who told him to rob a bank. The plan was given to him, and he could keep all the money for himself.
The idea of the game is to make a successful getaway each time that you rob a bank. Pick the cash, and the bullets on the road. You will need it should any cop appear. Your ammo is limited, so try not to shoot any civilians. The game will be easy at first, eventually it will become harder.