Navigation should keep the screen on by default.
If not grab an app from the play store.
when in navigation mode it will yeah, but I think he means just the map view? you could turn standby off in screen settings?
Developer options > Stay Awake while charging
Should keep the phone awake.
Can anyone recommend me a good room with no bloat where? Or a good website with nice guide I have never rooted a phone before.
CyanogenMod for sure. No bloatware, no Touchwiz crap, just (nearly) pure stock Android as Google intended.
Does your GPS work? was checking the "known issues" and it states GPS does not work 99% of the time