navtool/backup camera questions..

[euge]

I'm going through the process of finally installing navtool after procrastinating for a while. I installed the camera through the inlet of the license plate light on the left side and routed the wires through the connector that opens the liftgate. Few questions, i'd like to know if it's safe to power the Navtool through a constant 12v or an accessory 12v, and if so, where would I find a wire that gives ignition/accessory 12v power? and what color is the wire for the reverse brake light? the navtool has a green wire that needs to be connected to it. some pictures would help on the location as I'm not too familiar with the vehicle, only owned it for about 3 months lol. and how are you guys routing your wires from the backup camera?