There is a large learning curve (IMHO) so it will be helpful for the staff member who will facilitate the group to be somewhat knowledgeable on the game rules and play. I'm learning myself and hope to show instructional youtube videos at the beginning of meetings for beginners.

Sets are (relatively) expensive and there are several accessories required (racks, a mat). Some of the more expensive kits will have these. Hopefully some patrons will have sets they can bring too.

You might want to try out registration for every meeting - the game requires 3-4 people per table so it's nice knowing how many to expect (and arrange for).

The game calls for rule cards from the National Mah Jongg League - these are available for purchase through that organization and are about $15. The cards show which hands can win and has the rules. The cards change every year (so the winning hands also change), so each player in a game needs to be working with the same year card (e.g. all 4 players have the 2026 card). I'm considering finding a simplified version (perhaps something for kids) so it's easier for absolute beginners. The cards can be hard to decipher at first (just part of the learning curve).

While there are (I'm sure) many sites out there for info and advice, I've enjoyed The Mahjong Project. The creator of this site has also published a recent book. She also wrote a blog post on cultural appropriation which is a must-read for anyone starting a group.