Yes, do that at once!
You've got 1-3 weeks depending on timing with countless factors that each could ruin or give a boost to this tourney...

Also... Here are some rules...

1. Every team will play (two) rounds against every other team. One so that the other team chooses the level and the other so that the other one does.

2. After these rounds are played (teams that don't have the slightest bit of enthusiasm to arrange games will be eliminated and treated like thrash)...
The four teams that have scored the highest will make the playoffs.
The rest will either be eliminated without further ado, (OR...
They'll play extra and the highest scoring team(s) will make it back into the playoffs.)

3. The playoffs will consist of random pairs out of the remaining four teams that will play best of 7 rounds, picking levels in turns. The last level will possibly be voted by the public (besides the teams that play).

4. The winners of both pairs will meet in a best of 5, 7 or 9 rounds finale and the winning team of that will be crowned the National Cup Champion.

More rules, likely reported in the near future!