Steps/mm = 32000/25.4 = 1259.8425
Step and Dir pulse depend on the drive, but are usually set between 2 and 5.
Velocity and accel vary from machine to machine, and are usually set by trial and error. Start with a very low accel and slowly increase velocity until steps are missed, then back off 20-30%. Then increase accel until maxed, and again, decrease by 20-30%.