If you have a product then try sell it for bitcoins. Not that difficult to understand. People sell plenty of goods on the marketplace here though there are ebay style markets like cryptothrift where you can sell your items for coins.
But not all people gonna accepted bitcoin. In my country there are still people that wont buy it using bitcoin they prefer take fiat than bitcoin. I try to explain it but still they wont listen it and insist on taking fiat so thats the problem
not really a problem , those are isolated cases, especially if you sell in real life, via internet anyone(in theory) should prefer bitcoin over fiat as a payment, you need maybe to explain them how it work and they will jump in for sure