If you want to get better reference. Lay down two aim sticks, or dowels, like i mentioned. Makes sure your target line is over a driving range marker or flat. Then you can tell if the ball starts right or left, and if your alignment is ok. If you want, lay down another dowel perpendicular for ball position.
What i will do sometimes is take the alignment stick and place it about 10 yards in front of me, on my target line, at an angle pointing down range. This way i can get feedback as well.
There are many different ways you can get information at the range, a lot of them are very cheap.