Here are the guidelines:

-Both teams should have a same amount of players before the match begin.
(3 VS 3 or 5 VS 5 only)
-Every duels should be 2/3.No changing of decks once your duel started but side decking is allowed.
-The match should only last for 2 weeks.
-Disconnecting may result to a lost so be sure about your connection before starting.
-Duels can be advance rated/advance unrated.
-The Banned decks are: Exodia,OTK,FTK,Burn and Stall.

These are the kind of matches available for Teams Competition

Single Elimination:
-3 VS 3 or 5 VS 5.
-Pairings should be agreed by both teams.
-The team that accumulates the most wins will be the winner.

Crossfire:
-3 VS 3 or 5 VS 5.
-Players can target anyone from opposing team to duel.
-When a player loses her/his duel he/she is automatically out of the game.
-Teams who reach 0 players loses the competition.

Survival:
-3 VS 3 or 5 VS 5.
-Team leaders will decide who will be their first duelist and the winner of that match will go on to face the next opposing team duelist.
-Once the team is out players they loses the competition.

when is this?