Petrol Delivery APP -- 2

Hi, I want to build a simple APP, to buy Diesel/GAS and Petrol and deliver. this is how it will work: 1. User select product 2. User selects quantity and pays 3. User can view the trunk in a Map en-route to his address(LIVE tracking) 4. At delivery Supplier enters delivered and process is closed allowing for rating on both sides. 5. Payment options on delivery will be On Delivery or Card(Payment integration) App will have Supplier and Client end, will also have a web backend for Reports/Setting Products and cost per litre or kg, also price will be costed per km. Regards, Michael