DJing is an art as well as a science. It requires a lot of talent, passion and hard work to become a successful DJ. But without knowing exactly how to become a DJ, any and all your talent or skill will be wasted.
The first step in becoming a DJ is to learn what being a DJ is all about. A DJ is more than someone who plays good music at a club. He is a music connoisseur who stays abreast of the latest happenings of the music scheme. He is a charismatic leader who controls and dictates the action and rhythm of a party. Most importantly, he is someone who is completely in love with music and has devoted his life to it.
Once you know what being a DJ is about, you should get started on how to become a DJ.
Since I've stated already that DJing is as much art as science, it would be good to pick up a professional course and learn all the technical aspects of DJing. Plenty of full time DJs run their own courses, and you can easily find one in your city. They'll teach you everything from the technical aspects of the instruments such as turntables, to techniques such as mixing, scratching, etc. and will also help you get a grip on rhythm. As an aspiring DJ, a professional course is the most important investment you could make.
Next, peruse your music library and try to understand your own style of music. Every DJ should have a unique, signature style, and this can be formed only once you know what you yourself love to play. This may sound like a trivial step, but it can be the deciding factor in your success as a DJ.
Finally, the most important thing is to go out and get playing. This is easily the toughest step as it takes a lot of confidence to be the DJ at a party. Get started, even if its something as small as a friend's birthday party. Once you gain in confidence and ability, try to get some gigs at the local club. Network as much as you can – this is one skill no DJ can live without.
Remember that DJing is about charisma, and you can develop this only if you practice enough and put yourself out there. It can be intimidating at first, but landing your first few gigs is the most important step.