Everything I thought of has pretty much been mentioned... cell phone (duh), funds to pay for all the unanticipated expenses (and there will be some
), and paper & pen to write down all the stuff you realize you need as you "get your feet wet" camping. Eventually your RV will be stocked (in its own way) as your home is, where you have the household "stuff" you need & where to find it. But that takes awhile.
Test out absolutely EVERYTHING on the rig before you finalize the deal and drive away! And on multiple power sources (shore power, battery power, propane fuel) for those appliances that can be powered multiple ways... water heater, fridge, furnace (even though it's summer), roof A/C, dash A/C, generator if equipped, etc. Carefully inspect around all windows and roof lines for any sign of present/past water leaks... staining, soft walls or floors, peeling or bubbled wallpaper. Check all the tire DOT codes for age. If they are original on that 2009 rig (meaning tires from 2008), they definitely need to be replaced prior to traveling any significant distance. Motorhome tires increase in blowout likelihood after the 7-year mark (or so) regardless of how the exterior tread looks.
Make sure you have your insurance and especially
roadside assistance (including towing coverage that will accommodate the big/heavy demands of a motorhome) in place!
We have some very useful "New Buyer" inspection checklists in our forum library (link near the top of the page) that you can print out and take with you.
What an adventure awaits you! ;D We traveled about the same distance (IL to upstate NY) to buy our first motorhome, and I researched/shopped for a solid year before buying that rig. Even as sure as we were about the purchase, we still experienced unanticipated electrical problems which caused a breakdown (during rush hour in Niagara Falls, NY) on our 2nd day of ownership! It all worked out okay and we greatly enjoyed that rig for 5-6 years before selling it... but it sure was a baptism-by-fire way to start out.