dude, your new and im not gunna hate on you cos ive havnt been around so long myself, but you are about to be hit with a million sarcastic fuckwits who will give you heaps of shit and tell you that if you use the searchbar, there are at least 50 threads on box construction and surfce material.
anyway, the answer is lexan and you can get it from home depot. its not the cheapest thing in the world, but its the best.