The three basic front wheel adjustments on a non-rack and pinion non-strut front suspension MB are toe, camber and caster. Toe measured in distance is how much the front wheels point towards the centerline of the car in the direction of travel, camber measured as an angle is how far off vertical the front wheels are when viewed from the front of the car, and caster is how far off vertical the steering axis (e.g., imaginary line that joins the upper and lower balljoints) is when viewed from the side of the car. Rear wheel toe and camber are adjustable on some models.
An alignment job should include inspecting the steering and suspension components for wear, leaks, damage, etc.
I hope this helps.