Click the door to let people in to your club. Click the buy button to purchase upgrades. Try to balance the volume, to low and people will leave quickly. But if it is to high the police might make a visit. Hire bouncers to deal with the police. People who leave your club will tell others about it which will increase your reputation and bring in more people. The more people that are in your club and the greater your reputation is the more money you will make.