AUDIO HELP

Hello, I just bought a new 2002 ES, I want to change my sound system, i have the base CDplayer with speakers, can someone tell me in what order I should buy things, and what sizes?

I'm thinking of a Pioneer Head Unit
New Speakers
Sub
Amp

Preferably in that order, the amp would just be to boos the sub, I will get the two at the same time... I just wanted to know speaker sizes..'cause I dunno 'em, and What kind of details I should know..such as I heard on 2002 HOnda Civic, you needa buy special wiring..like a monopoly from honda.:frog:

Please help..E-mail: MotekChaham789@aol.com

def go for the head unit first, then the amp for the sub + sub, then speakers, then amp for the speakers... the speakers and 6 3/4 BUT 6 3/4 aftermarket speakers wont fit perfect... your best bet is to get 6 1/2 b/c there is a larger selection, then order oversize adapters from www.crutchfield.com

are the speakers the same size in the 02 oz rally edition?