skanji:
1. Download the handheld OS from your carrier's site to your PC. Run the EXE file and it will load to your PC, and then Desktop Manager and App Loader will load your themes/
2. ditto.
3. Google Maps reqiuires a data plan or TCP. If you don't have a Data Plan, try this, and see if it works.
What are the TCP and APN settings? - BlackBerryFAQ
What do I need a Data Plan for? - BlackBerryFAQ
How to use BlackBerry on Generic Data Plan - BlackBerryFAQ
Good luck and welcome to the Forums.