There is no set way to become a club promoter; you will be left to your own creative devices to find the best way for you, and it often starts by being very familiar with the club scene in your area. This essentially means you are doing research by going out to the club, but don't go out just to party: take note of what the current promoters have done to market the party, what partygoers want from the club during the party, and what attracted people to that party in the first place. The first step you must take if you want to become a club promoter is learning as much as possible about the job and the area you intend to serve.
The best way to become a club promoter quickly is to identify a niche audience that is under-served. Take note of the groups of people who go to the clubs, as well as new or smaller clubs that may need your services, and start to develop a marketing plan for getting people to show up. You may want to approach the club owner or management first, as they may be able to give you some resources for getting started. It is best to start with a small club or venue at first if you want to become a club promoter quickly. This is advantageous because filling a small club will be easier than filling a large one, so you will be more likely to draw attention by filling a smaller venue.
Be sure to meet with local club owners and other promoters who might be able to help you become a club promoter on your own. Be friendly, and be sure you enjoy the club scene, because you will spend a significant amount of time in those clubs. Approach owners and management with a positive attitude and some marketing ideas; the more prepared you are, the more likely you will be to succeed in promoting a party or event at the venue.
Sometimes one of the biggest draws to any party or event is the talent that will be performing. If possible, hire a DJ, musician, celebrity, or even just a photographer to attend the party. This alone could draw in many partygoers, but if you cannot secure a big name, you will need to plan the party to entertain patrons. Make sure there is music, events, appearances, giveaways, drink specials, and so on to cater to the patrons.