Custom Windows POS with Bluetooth Printer

I need a small-footprint Windows application tailored for my dabeli outlet. The core workflow is straightforward: when a customer places an order I should be able to ring it up, print a combined bill-and-coupon... (Budget: ₹12500 - ₹37500 INR, Jobs: .NET, Bluetooth, C# Programming, Inventory Management, Software Development, SQLite)