You get the Tron Table + 2 Tron Chairs. But you need 25,000 points by the time you finish the game to get the code. There is a time bonus for points, but I'm not sure what it is exactly. I've gotten 13,000 extra points for a time around 5 minutes.
I suggest going slowly at first, don't try and rush things. First time playing, you should save at almost every "Save spot". Maybe explore and see where the items you need are. All you can do is practice, once you develop some sort of strategy