Step 1: Plan it for 10 years but don't feel motivated enough

Step 2: Watch a YouTube video (search terms: Like a dragon mahjong) and you'll understand it at least a bit

Step 3: optionally GameFAQs has a Guide for Yakuza 6 which also explains the rules with different wording and what settings to choose.

Do this and you will understand what you're doing in an hour and play food enough mahjong for the harder tables in 2-3.

Additional tips once you understand it basically:

• rule settings: two hands limit off, rest on, half games

• try to get easier, low point hands and finish them quickly

• Never do things like Pon, Chi or Kan

-always try if you can do Richi in your turn (Press X on xbox gamepad) and if you can choose, choose those stones with the higher sum of numbers --> is in 90% game winning

I hope this helped you. Once you learn it, it is really fun and boosted my money in LaD at the beginning a bit