Tuning Procedure for generic Quadplane

Hi,
I am making a quad plane with wingspan of 1.6 meter with maximum takeoff weight of 12Kg, running Arduplane 4.0.9 firmware . Since I am new to arduplane, I dont have any practical knowledge in quadplane tuning. Can anyone please suggest a procedure of method to tune it?

The wiki and autotune

See this page:
https://ardupilot.org/plane/docs/quadplane-vtol-tuning-process.html

Are you sure about your 12kg target? It seems a lot for a 1.6m wingspan plane.