Removing the 5 o'clock shadow through laser treatment?

I always have this shadow/different skin colour (specially on to upper lip) regardless how close I shave, so I thought to remove or reduce the beard through laser treatment. My question is: -Laser treatment remove the 5'clock? -Do i have to remove completely the beard for a nice result? my goal is to get rid of the shadow -How long is the healing time? -I have to be careful with sun light? If I had to go out what should I do If it helps* My beard is black and pretty think I'm almost 19