How to set caster?

Yes ride height first.I must of got lucky with my first try at setting the alinement on my 69 dart I got the height were I like it than pulled the front arms as far out as i could and pushed the rears as far as they would go,measured the toe.Car steers like on rails no pulling and the tires are wearing great,never did take it to a rack.Good luck you will get there.