General Questions about Audio

Ive got an '02 Civic LX and I was just curious about my audio system in general. I already bought a Kenwood CD player, but now Im confused as to what I need next, ie: speakers, amps, subs, etc... I know its kind of a broad question, but any help would be awesome.
Thanks!

thats up to you. it all depends on what you are looking for.are you looking for bass or just louder sound.?

94 is right, it's up to you, just buy what you can when you can and make a work in progress.