I am from low income family class. I want to sell items on Amazon, but I don’t know about my success rate. As per my knowledge, GST is required for selling products on E-commerce sites.

Suppose, I have GST number. What if I don’t get any sales or low amount of sales ? Do I need to fill GST ?

What if I stopped selling items on e-commerce sites. Do I still need to fill GST ?

Can I cancel my GST number ?

What if I cancelled my GST number and after year(s) started a new business which requires GST number ?