How to connect Computer to stereo system.

Hello everyone. Just finally complete my first stereo system in my bedroom. My computer in the same set-up and I threw away the cheap pc speakers. Now am just curious on how I would go about connecting my computer to my stereo system for general use for all my Mp3 files, Atrac and yes some gaming (extremly little). Also my computer will need to be my source until my funds rejuvenate. I already own a M-audio audiophile breakout box. Is that all I need? Or is there something else I require. Would I simply connect my innterconnector to the line out of the m-audio into my line in of the nad c320bee? Let me know guys thanks.