It's up to you of course but from experience I've found that the study groups that work best with people remaining interested and not dropping out are the ones that study the cards in a random order with anyone who wants to starting a thread.
If you put lots of rules and organisation in there people start waiting for others to start threads and are afraid of messing up the order. This causes people to drop out of the group and the group fizzles out.
I've started an index for the second edition deck and put it at the top of this forum
here (click)
Please let me know by PM when a new thread is started and I'll add it to the index.
Have fun
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Sulis - Tarot Study Groups moderator