Hi Hydrops,
The pp is for Metric units (G21).
Height is unimportant as the pp does not create any Z axis moves only X and Y (with M11P1 for G01,G02,G03 ... moves and M10P1 for G00 moves).
Feed setting depends on many factors so perhaps use F600 (or whatever you think will be right) as a starting point (it's easy enough to edit the final Gcode as required).
Tweakie.