I am looking to get a rough quote of an e-commerce project for my business

I have a hyper market, and would like to develop an app (android and IOS) that facilitates customers to do an online shopping.
Customers would install my app, register using their phone number and then they can add items to the cart and specify their address. The seller (shop) on the other hand would have a portal to receive orders and prepare the requested item. 

I am also thinking to add an extra feature (either with the same app above or using s separate app), (the delivery) and to arrange with few local people to be as delivery boys.
The seller would put a delivery request (from---to) and any nearby delivery boy would accept it, this means that the delivery boy would have an access to the app/system so he can accept/cancel delivery requests.

Or in another word, I am looking to get something like either Just Eat (idea No1) or Deliveroo (Idea No 2) above.

Thanks
Salim