Hello,
You are starting an e-commerce site, so you would be facilitating the supply of goods/services of other person registered on your site and would be termed as an E-commerce Operator.
An E-commerce operator is required to get compulsorily registered under GST irrespective of their turnover/receipts. Since you would be starting to deliver products, you would be liable to charge GST on your commission and also collect TCS from the consideration received on behalf of the supplier of goods/services. So yes, you would be liable to get GST registration.
Regarding the place of registration, there is no requirement to register from a commercial area only, you can work from home or some other place and get registration on that basis.
If you going to supply only your own products/services from this site, then there is a limit of turnover/receipts of Rs. 20 Lacs /40 Lacs. On excedding this limit you would be required to get GST registration. But if you make any interstate supply of goods(i.e. out of your state of registration) then also you would have to get registered under GST without any limit.
I hope this answer satisfies your requirement.
Regards,
CA Hunny Badlani