If my memory serves me correctly, I think one of the rules was that you had to contact your SS once a month. You could send a card, a little gift, or whatever.
I think we sent what our favorite things and hobbies were...along with some general info, like our address, birthday, anniversary, etc....and sent that info to the person in charge. Then that person emailed that info to the secret sister.
I think it's a good time to start SS up since the holidays are getting closer. I guess we need to determine how long SS will run.