This is a very large project. What should I build first so you see real progress fast? Full storefront UI first (Recommended)
Do you want a real backend (database + auth + saved orders) now, or a clean frontend with sample data that connects to a backend later? Use Supabase
For online payments you described a GPay/UPI QR + screenshot upload flow. Should I build that, or use Stripe? GPay/UPI QR + screenshot upload (Recommended)
You want order details emailed to you automatically. How should I handle that? Set up email now