The following are just an outline and will discuss more later one by one
you will need to develop for these main 3 features; will include third-party integration & other necessary things.
I'm not sure about the price ... just bid and negotiate.
You'll going to need aftersale service for maintaince.
1. Website (convert from web app ok)
2. Mobile apps for customers on iOS and Android
3. Mobile apps for delivery stuff
4. Service operators and restaurants to perform administrative functions