Integrated 7.1 Channel Audio

Hi, I got this new Dell computer which comes with this Integrated 7.1 Channel Audio output. I do have a 7.1 stereo system at home and thought that this computer would be perfect for me. However, upon receiving the computer, I am really puzzled by the way to connect these two. On the back of this new computer, there are 6 audio connection holes. I recognize one of them is for microphone, but did not know which is which much beyond that. Other other five audio outputs are in different colors (green, black, pink, etc) and have certain signs with it. I think I have pretty good idea that the green one is for the two front speakers, the black one might be for the subwoofer (not so sure). But what are others? Does anyone have any idea about them? How can I connect them to my stereo? Also obviously the subwoofer does not require a two channel signal, does that mean that I have to use different kind of Stereo Plug/RCA Plug cable? Any help or detailed instructions will be appreciated! Thanks!