Check out https://cypher.space powered by nostr, easy start, no tech know-how required, ecash compatible!

If you want to go hard core... consider BTCpay server, you can play around with it at https://mainnet.demo.btcpayserver.org/ and create your own shop there. Or better, subscribe for a VPS like.. can't remember the names. Voltage offers BTCpay too! If you need to receive sats, then connect an LNbits.com instance.

All the above get easier when you run your public node on clearnet...