Here’s some starting points:
How to succeed at DJing…a 13-part general coverage of how to get yourself from bedroom to gigging. I do need to update this series though.
http://www.digitaldjtips.com/2011/03/how-to-succeed-at-djing-part-1/
How To Promote Events & Throw Your Own Parties. A 6-part series on being an event promoter. If anything, it’ll help a DJ think like a promoter and thus work events to the benefit of the event.
http://www.digitaldjtips.com/2011/09/how-to-promote-events-throw-your-own-parties-part-1/
Creating Killer DJ Promotional Materials. 6-part series on writing a bio, designing a logo, taking promo photos, print and web pieces, and even video.
http://www.digitaldjtips.com/2014/02/creating-killer-dj-promotional-materials-part-1/