I’m far from an expert on The Pi having only been using it for about an hour here. There is a lot of info on the web though so just do a quick google.
Adafruit has a really nice clear case for the Pi, her stuff is always worth the money! You can see the 15 dollar case at this link. (I ordered one myself but it’s on backorder)
http://www.adafruit.com/products/859
What are you using for input? Are you using a usb hub? I can’t access YouTube easily because I’m on my Edgejr tablet at the moment.