Some good advice all round here
My inputs
All the places to stay have pro's and cons. Think most have been covered. I stayed in Oz Station and would do that again.
If you are a good rider, and have some luck, making the Avalanche or the 2nd (promo?) is pretty do-able. Crashes and technicals can and likley will play there part.
Fitness is key. Upper body as much as cycling. It is hard riding that long & fast on rocky terrain. Regardless of goal the fitter / stronger you are the better
A 6 inch bike with 'dropper' seatpost is probably the ideal bike.
First time out set yourself a goal of enjoying yourself.
Go a few days early and pre ride the qualifier and main course as much as you can. They are good fun but just as importantly pick some alternate lines you can use if required. Chances are you will get held up somewhere. It will frustrate you if (when) you get stuck behind people walking sections you can ride. I got knocked off on the very first corner last year. I wish I had thought of this before the event.
Entries are January I think. It sells out quickly so get in ASAP.
Be prepared to want to go back 😀