Welcome to the BBForums.
1. Hide unsent messages: not a way I know of. A simple delete works for me.
2. Not that I am aware of. Would be cool, but I have not seen that ability to send the GPS signal from the BB to a laptop either via Bluetooth or USB.
3. a. Our FAQ, the best place to start. BlackBerry FAQ - BlackBerryFAQ
b. Any of the Sticky Notes at the top of the many sections of this forum.
c. Stinsonddog's Tips/Tricks, in my sig below.
Additionally, please watch you language on the Forums here. We are a professional community.
I bet there was a single PDF manual file on the CD you got with your BB, if you purchased it new.