Suffering Question!! What Poliitur??

The car I want to polish is black metallic and exactly one year old. The paint shows the usual wash road scratchers. In 3 weeks I drive on vacation with the car, but before the scratches must be out. After that it should be sealed to avoid more scratches, as you know it is always dusty in the south. I have read a lot and 3m products seem to be best. My question is now related to this because yes the Which polishes should I get, in which order???? I know a much asked question that I wanted to personalize here, since everyone drives a different car with different paint condition. Thank you in advance Greetz Babylocc