Small scale Poly House farming

Hello everyone,

I am a farm enthusiast and want to start a small scale Ploy House / Net House farming on my own agricultural land.

I have following questions : -
1.) What should be my minimum area of land (in Sq Meters) to start Ploy House / Net House farming?
2.) What is the total cost of Poly House / Net House setup per 100 Sq meters?
3.) What are the best suitable commercial crops recommended for Ploy House / Net House farming?