Thanks for the questions.
1) Competitions are fun. Some are tougher than others. They will group you by rank, age, and weight. Matches are won by points or submissions. Checkout IBJJF.org and read the rule book if you are interested.
2) I use tide sport with febreeze. You can also add a scoop of oxyclean. I never bleach the gi as it will break it down faster.
3) The cards have the basics of the Fundamental curriculum on them. In the past we would line up with them and they would record attendance. Now we sign in on the iPad before class. You can always refer back to the curriculum cards for reference to what techniques are expected.
We work hard to create a friendly atmosphere. Thanks for being a part of it!