Help needed! Rc model plane to uav

Hi guys I have a model plane that I want to convert into an outonomous plane, I want to configure it with the combustion engine and the airspeed sensor so I can have a true autonomous plane with advanced functions like auto take off and landing.

Can someone share give me guidelines, information, recommended readings, etc??

https://ardupilot.org/plane/docs/arduplane-setup.html

https://ardupilot.org/plane/docs/common-ice.html?highlight=internal%20combustion