Here you go! The first link here is full instructions on how to reload a rootable software on your phone using RSD lite.
The second link here is for the CM7 (Cyanogenmod 7) build for the D2G. I think you will really like this if you are new to ROMs.
[ROM] CyanogenMod 7 for the Motorola Droid 2 Global :: V7.1.0 (9 Oct 2011) - xda-developers