1 - Research what crypto currencies you want to accept. Each crypto currency has a different value proposition.
2 Research wallets (different wallets for different use cases) a wallet just holds your funds.
3 QR Code- A wallet can pegged to a QR code.
This QR will be the Point of Sale. Just print it out and put it by the cashier.
4 that's it! You're ready to let the market determine your worth