How to flash a Rom properly?
Rom installation failed on "error 7" in recovery, what can i do?
Best will be to post a recovery.log. There's an option inside your recovery to create one.
You can get the log to your PC using adb:
adb pull /path/to/log/log.name
If this is not possible for your: tell the whole message you get! There are different "error 7" messages out!
How to enable root access?
OMAP4-AOSP Roms aren't pre-rooted, you need to use SuperSu or the OpenSource SuperUser to get rooted.
How do i get proper logs?
Well, there are some apps out (e.g. Syslog App) which can help getting usefull logs, but i prefer using adb to get those logs:
adb shell logcat > logcat.txt
(abort/stop logging pressing ctrl + c on your keyboard)
adb logcat -b radio -v time -d > logcat_radio.log
adb shell dmesg > dmesg.txt
adb shell su -c "cat /proc/last_kmsg" > last_kmsg.txt
(make sure root is enabled!)
adb root
adb pull /data/misc/audit/audit.log