For setting up in imperial units you need to do two things, first is go to Config menu then Stet Native Units and choose Inch. Next is Config menu then Motor Tuning and set the steps per unit, Velocity and acceleration to Inch compatible units. If it is all ready set up accurately in metric then just divide the steps per unit, Velocity and Acceleration by 25.4.
Your other questions will depend on what you have so unless you say what hardware you have no one can give you an answer.
Hood