Hi there! If I understood you correctly, you want to use btc as a payment method. Well, the first step for each newbie is to create an account on a cryptocurrency exchange. It might be better to choose user-friendly exchange.  CEX (https://cex.io/) might fit you, as it’s kinda convenient. Besides, you’ll need to use online wallet. I’m not quite sure that I can suggest you a way to use bitcoin as a payment method, but it certainly won’t work with a hardware wallet. So, you’ll need to keep your crypto online.