you need to get either Droid X or Droid 2 Bootstrapper
and you need to hit bootstrap recovery, give it superuser access, then hit ok for success
then hit reboot recovery to enter into clockwork recovery
before installing anyrom, be sure to wipe data/factory reset within Clockwork Recovery(CWR) and be sure to wipe cache partition as well
then you need to install zip from sdcard
and you need to choose zip from sdcard
then install it, and reboot
as for roms, there are numerous roms to chose from that offer good battery life, no one here can tell you which rom is best for your phone, some may suggest apex
others may say ssm, some might say shuji
only way to know for sure is to download them, and install each one on your device, and run it for a day or so to see if you like it.
wiping data/factory reset will not erase your pictures, so dont fear that