1. With a cloth.
2. 8330s are the only ones in the 83xx who are SUPPOSED to get an update.
3. Download the latest version from App World. I have no problems with it.
Check out the bb 101's under bb help top of page... learn your berry. It takes a while to under stand it has a phone function and then the pda function. Look around and decide what you want it to do. Games, on line apps like face book surf....themes
The best cleaning I found is a microfiber cloth available in most photo shops. Others talk about alcohol or other liquids but I fear the problems that may develop.
Welcome to CrackBerry. This is the learning place. Like plunkingtom suggested head for BlackBerry 101 in the Help forums. Much to be learned there to set you on the right path.