I will jumping into a Friends+ instance soon (10pm EST give or take), I don't really know how those works but I assume friends can simply join on me, and go from there.
If you want to join but don't have anyone in the instance just post and I'll try to keep an eye on the thread
World: https://vrchat.com/home/launch?worldId=wrld_06256a1e-cc14-4946-8258-da94909c7daf
You don't need any experience at all, you don't even need to wait for your headset to arrive, or worry if you prefer to be mute, all is accounted for. Just have fun with some mahjong.

LINKS graciously borrowed from /mjg/
Their guide with everything: https://mjg-repo.neocities.org/
Riichi Mahjong Pastebin: https://mjg-repo.neocities.org/pastebin/Mahjong-Live-Pastebin-v1.2.html
And if you don't like reading, here's a starter: https://www.youtube.com/watch?v=mcmQqPhKvWg&t=5s
And his basics playlists: https://www.youtube.com/playlist?list=PLPBLBlC-7G3s92GyGOprSmZ1mqgh0U0DI
(Don't worry about the setup or rotation of winds)

I'll be staying for est, cst, and pst, maybe hawaii's new years, and play some videos accordingly. Or whatever. Tanki.