It's actually quite simple.
It's a normal way of playing, that is, drawing lots, AB two groups, four groups and three groups. As for the points in the group stage, the same points depend on the number of wins and the goal difference, with two people in each group. Then there will be the semi-finals and finals. Three or four people call again, and it will be all right. 2 1 ball system, best of three games.