it all kind of equipment you can use to DJ..you can do the PC thing(just for mixtapes..unless you doin the laptop thing), Vinyl(turntables) but you gotta lug all those records along..or the Top CD Loader way..which is becoming more and more popular nowadays.. some good book for you to read:
How to be a DJ
Chuck Fresh, Charles A. Graudins
How to DJ Right: The Art and Science of Playing Records
Frank Broughton, Bill Brewster
The Mobile DJ Handbook: How to Start & Run a Profitable Mobile Disc Jockey Service
Stacy Zemon
How to DJ: The Insider's Guide to Success on the Decks
Tom Frederikse, Point Blank, Phil Benedictus
any bookstore should have them or can order them for you..