deck, speakers, subs, amps, glowing lights, hula girls the rhythmically gyrate to the music.....
its all easy, just takes time and patience. any place you purchase your equipement from will more then likely install it for you for free. best upgrade a small sub and new speakers.
or, the single best upgrade you can do cut your speaker wires and your done. enjoy the silence and you still have your 6 disk cd changer. the sound of your engine has no comparison.
and you could just always try typing in 'car audio' in google and educate yourself.