Mainly go by the following guide → https://ellis3dp.com/Print-Tuning-Guide/
Calibrate rotation distance
Mark filament, extrude 100mm, measure and calculate new value based on actually extruded filament length. Then test new value with same procedure, if correct store in printer.cfg
M83 ; E relative
G1 E100 F60 ; Extrude 100mm at 1mm/s (60mm/min)
<new_rotation_distance> = <previous_rotation_distance> * ( <actual_extrude_distance> / 100 )
SET_EXTRUDER_ROTATION_DISTANCE EXTRUDER=extruder DISTANCE=<new_rotation_distance>
First layer squish
Use 120% line width and 0.3mm layer height for first layer.
Do rough z-offset with PROBE_CALIBRATE