You can store your products at your place or your warehouse and start selling online even by registering at Amazon, if and only if you have a physical store.

To sell the grocery and other preservative food items, you need the FSSAI license and ‘gumashta’ and tax registration.

https://www.quora.com/What-license-and-registrations-do-I-need-for-an-online-grocery-delivery-service-where-Ill-stock-the-items-in-my-store-house/answer/Builderfly-Company