I agree with Audiolui. Level the table and the Micropoise will tell you when the arm is level, and give you a good starting point for fine tuning the VTA.
When you get VTA dialed in, note the position of the bubble wrt to the indicator lines. You can then adjust the VTA to repeat that setting for records of other thicknesses.
When you get VTA dialed in, note the position of the bubble wrt to the indicator lines. You can then adjust the VTA to repeat that setting for records of other thicknesses.