A quick, easy and effective way is to use https://pay.zapit.live/ .

There is many other nostr apps but this one is the most stable in my experience. Unfortunately it lacks many features to set up a perfect shop. But I can hardly recommend other platforms like lnbits and plebian.market since I've had difficulty with them. The guys are doing great work but it is hard work and not on point yet.

Amethyst recently added a feature which can allow you to add a product to the nostr marketplace in less than a minute. But it is more like a Craigslist experience.

The best move is to set up a website using woocommers and BTCpay. Requires a lot more effort and technical knowledge. Our friends at Agora256.com are helping with the server.