Naters, I just googled "Ride well Tour". Looks like a terrific journey. It should draw an interesting mix of participants... different backgrounds and biking, camping experience.
Pick your bike, then put some miles on it. You need to have the saddle and general bike fit dialed in before you start. Don't know if you live where you can ride outside this winter. If not, get to a fitness center where you can ride a stationary bike, or better still, ride your own bike on a trainer. Final advice, learn basic bike maintenance and you will be an asset on the journey.
Best wishes as you prepare, and for your journey.