ok, well i work at an alignment shop, its what ive been doing for a living for the past little while. the things that could make a car pull one way or the other:
either caster is off tires need to be rotated, you need new tires all together the road is angled something is bent or your steering wheel is off and you are trying to make it straight so it pulls. caster is the angle or degree your wheels are at when making a turn. im not a professional yet, but im learning. when the caster is off, one wheel will be slightly further back then the other when the tires are straight, you can measure this with your hands. if it way off then you probably have something bent. if you look and nothing seems to be bent then you can loosen some bolts that hold the subframe to the body and push it forward.
i checked mine the other day cause its pulling and the wheel bar is off. the right side is further back than the left. been really busy, and havent fixed it yet.
well i hope maybe this answered some questions. if you have any, just ask