Help me build a website for a startup.

Job ID: 33720493

Budget: ₹1,500 – ₹12,500 INR

I got a project form a Company that provides delivery services to other local businesses and people. But this is my first project and I am still learning and the work is too much for me to handle alone.
I want someone who can do the backend stuff and I'll deal with the front end.

The company/startup is based in Chandigarh, India and it provides delivery services to the locals and other small businesses/shops such as grocey shops,medicine shops ,bakeries,restraunts or to people who want their stuff delivered.

The company wants a website that can take the users order ( their name, item type, pickup location ,drop location) cash collections from drop point if any (in case of shops, bakeries). Calculate and show the total charge and then send the order to them through WhatsApp , and it in the backend (and in a google sheet). There will be no payment through website only cash on delivery for now.
They provide services only in one city and get 15-20 order per day for now.
They don't need to track delivery boys etc , just get the orders.

I am still learning web development and know little about the backend and I need help in setting up the APIs

For reference they want a site like http://www.Dunzo.com/ but only the pickup/deliver option (I have attached few images below).