What I need to be a party dj? Extreme beginner?

I'm going to college in September and no one at the school djs parties, they just play music from an iPhone on ihomes right now. I sort of dj my own hs party last year, but that was with some free dj PC software, beats studio headphones and my dads Bose sound system( which I'm not allowed to even breathe on anymore after the party, broke a wire had to be replaced). My question is, what do I need to be a good dj in college? I'm getting a MacBook Pro along with my dell Inspiron, have beats studios and about to buy V-Moda cross fade LP. I have Sam ash and guitar center up the road so I can lock and load. Also, I will need some pretty decently loud speakers for big dorm parties. Thank you, budget is Max 500$ for everything. Software, speakers, mix board ext thank you. Was looking into maybe the Behringer 215XL, a controller, stand, and maybe some other stuff? Any help is appreciated!

Please DO NOT buy home stereo or home theater speakers for DJing.

You need a bigger budget - save your money FOR YOUR SPEAKERS!

Your audience only cares about BIG SOUND - big professional speakers will do that.

As a bare minimum, you will need a pair of 15 inch speaker and a professional amp.

http://www.amazon.com/...001U5JFNM/

http://www.amazon.com/...0002E26L0/

All you need is a laptop, simple DJ mixer and the speaker system (amp and speakers or powered speakers).