Great!
So, beyond the dinner that is provided on Friday night, you need to be ready to feed yourselves for that time period. There is a King Soopers pretty close by, and a small local food co-op, so bring what you need for the week. If you want to go on the inexpensive side of camping you can always stay on BLM for free, but you will be away from all of the action. So, budget for your food cost, the cheap way being feeding yourselves, and the expensive way being eating out in Moab every night.
As far as housing goes check out
https://www.cruisemoab.com/camping/ as it will have all the pricing for camping onsite and what it will cost you.
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