Blue card is a 2 minute penalty and your team plays short.
A yellow card (or 2 blue cards) is a 4 minute player penalty and a 2 minute team penalty, meaning your team can go back to full strength after 2 minutes, with the exception of the penalized player.
A red card (or 3 blue cards) is 5 a minute team penalty and an automatic player ejection. This player will also receive a minimum 1 week suspension pending review.
If the goalkeeper receives a card, a player currently on the field may serve the penalty.