Gearslutz Fresher Need ADVICE From ALL PROs

[rickstar_online]

Whats up guys I'm new to dis site n dis is my 1st post. woOOo.
Neway cuttin to the point. I'm a Uk rapper n I've just made n mixed a new track, its called 'Get That Doe' listen to it @ http://www.myspace.com/rickstaronline
I got given the instrumental as a aiff and mixed my vocals on top using various plug ins then final plug to up all levels of all etc.

I NEED ADVICE ON HOW TO MAKE MY FUTURE PRODUCTIONs SOUND MORE PROFESSIONAL!!

To mix this track I used a Battered up 867mhz PowerBook G4 (I know i need a faster computer but this will hav to do for a couple of months), Rode NT1a (decent mic?), Mbox2 Mini, ProTools LE 7, Waves Diamond Bundle and Wave Art Power Suite.

I would appreciate any advice. Thanks