How do i hook up a computer to my cars audio?

i have a 95 mazda mx-6 and it doesn't have a radio deck in it. just an empty din with a few wires hanging loose in it. one of the wires looks like an actual plug of some kind that would hook to the back of an audio unit. i'm trying to hook the speakers to a computer, so i'm guessing i have to get a converter for that plug to 3.5mm jack or something. maybe not? how do i do this?How do i hook up a computer to my cars audio?
yep and im guessing you dont have surround or youve got a desktop and a really long extension chord. actually your still gonna need a power amp to push the speakers. heck back in the day we would hook up walkmans to our radios so you could play both.