How to choose the right motor for your multicopter drone

I’m thinking about building a quadcopter, I’m estimating a frame + components of 2.5 KG

So, I’m trying to find out how much thrust each motor needs to provide as I want to hover about 50% of throttle.

2500 grams X 2 X 1.2 (the 20%) = 6000 grams total
6000 grams / 4 motors = 1500 grams

I just wanted to know if I’m right or there’s anything I’m missing.
Would you please suggest me a good motor for this kinda weight.