Yes Yes Yes. Welcome and enjoy the site. As other have said, there is a lot of knowledge here and ppl to help. I see everything was addressed except your GPS questions. If you check out the link below it will give you absolutely everything there is you need to know about the radios, flashing ROMs, enabling GPS and more.
Step by Step tutorial for unlocking your device and cooking your own ROM!!!
http://forum.ppcgeeks.com/showthread.php?t=33857