Just put on my new mini lathe cnc kit and I am now trying to tune/calibrate my Motors to Mach3.

I have never tuned motors before... The only problem I am having is figuring out my X axis 1/2-10 acme screw ??? What Steps per values do I need on my X axis 1/2-10 acme ??? I have NEMA 23 270 oz motors so I am assuming they have 200 rpm? From researching here on the web I think I need a 2000 Step per value? Can anyone confirm?
For my Z axis I have a 1/2" 4mm pitch ball nut screw and I have no Idea what steps per value I need or how to even calculate


Please anyone with the same values, could you please help me