The amount of thrust needed depends on how you want to fly.

A slow flying trainer, the thrust will need to be 60-80% of the weight of the plane.

A typical plane, 80-100%. A war bird or one with a little zip will be 100-150%. A 3D plane will need 150-200% thrust to plane weight.

Here is a FT thread with more information.

https://forum.flitetest.com/index.php?threads/thrust-vs-power-to-weight-ratios-for-prop-planes.5102/
Watts per pound is another useful guideline. You'll need to weigh the plane and estimate the weight of the motor and battery.

• 50 to 70 watts per pound is the minimum level of power, good for park flyers and lightly loaded slow flyers.

•70 to 90 watts per pound is perfect for trainers and slow-flying aircraft.

•90 to 110 watts per pound is good for fast-flying scale models and some sport aerobatic aircraft.

•110 to 130 watts per pound is what you want for advanced aerobatics and high-speed aircraft.

•130 to 150 watts per pound is needed for lightly loaded 3D models and ducted fans.

•150 to 210+ watts per pound gives unlimited performance for any 3D model.