all the kits will get you started for correction, but you need to prep the panel before machining it. Wash, de tar, clay, plenty of MF clothes for wiping down. after machining the panel should be cleaned or wiped down, then you start on cleansers / glazes / sealants / waxes etc etc etc.
As said all this will have already been asked on the 1st couple of pages of the car detailing sub section.