You should only need to have Java and then download the server and open the port if they want to play vanilla mc. If they want modded then idk.
You might also want to check this out, haven’t used it myself but it looks cool if you don’t like wasting server resources: https://github.com/timvisee/lazymc
They don’t seem to have 100% pass of the tests, but I might be missing something?
Would love to take the jump, but I think I’ll wait until they pass all tests