Its really easy to set up just download Wallet of Satoshi from the app store
https://apps.apple.com/us/app/wallet-of-satoshi/id1438599608
https://play.google.com/store/apps/details?id=com.livingroomofsatoshi.wallet
Open the app click Receive
Then click the lightning address
It should now be copied. Go to your Nostr profile and paste it where it asks for a lightning address. Now people can send you some bitcoin ⚡️
If you need alternative method DM me I'm more than happy to help you set something up to receive some sats.