Store aggregator

New Member
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I'm new to Shopify and trying to implement a business flow where

1) A customer searches for shops within its postcode 
2) Selects a shop from the list shown and is taken to a list of items being sold by that shop
3) Adds items to the cart and checkout
4) Checkout select option for delivery (with charges) or collection

To implement above, I also need
1) Store to signup with my app
2) Notification/email sent to store when an order is placed?
3) Ratings for store upon order completion.

Are there any themes which help develop the above use case?