I have only been on one run with these fellas, so i am not a full bottle on it. you say new to off road, so i will write everything even if its obvious.
you wont need recovery gear, the other guys should have some. chuck in a shovel if you can, you can normally pretty much lift a brumby out of sand anyway.
if you have access to a 2 way radio, definitely take that. hopefully someone will have a spare if you dont.
have you got your 14s on? at stock hight you will struggle in places, with the 14s you should be fine. I was just running 14s and a small strut lift and had no trouble. Get there with a full tank of fuel, you shouldn't need more than that (if these guys are at their best, you will be drinking cc's in the ocean by mid morning

).
A pressure gauge and compressor would go a long way, you can borrow someone elses if you dont have them. If you are struggling in the sand, let your tyres down more. probably start around 15psi, be prepared to go as low as 6-8 if it gets tough. be aware that doing drifts and driving over rocks can damage your tyres when they are that low, but its the best thing on sand.
remember food and drink, nothing worse than being hungry out there.
also, if you think your suby's exhaust is loud... dont worry, you wont be able to hear it behind the others

I think the hatchie isn't going, but that is truly amazing!
you will have fun, great bunch of guys to hang out with
