Yes, they are fun.
First you need to be a paying member to join one.
Check the "group size" if the group size is large you get a lot of games. The group is the number of people playing each other.
3 points for a win, 1 point for a draw... most points from each group advances to the next round.
Most tourneys take a good year or so to finish...
Also be sure to check things like move days and timebanks to get an idea of how often you should be moving.
Fun, fun fun.
P-