WOW, that's a tough one to answer.. It's like telling someone how to build an engine when they're not a mechanic. 100% of the information you need to accomplish your goals is here, but not having a grasp on computer technology makes it hard to absorb. My best suggestion is to first understand (or get someone who already does) what components do what inside your PC. Once you gain that knowledge, you'll be able to get a firm grasp on what's all going on here, and what's all required to play mp3's in your car with a computer.