Richard - To get started - a few "essentials" -
-potable water hose. 15 footer will usually work.
-sewer hose and connector. Don't over-buy! A ten foot "slinky" type will just fit in the labeled compartment in the utility bin - with just one fitting. You will have to trim the tabs off the fitting to get it to fit through the exit hole in the Solera's utility cabinet (several posts in the Solera section) (unless you enlarge the hole, as Henry suggested above). A ten footer with only one end will work essentially everywhere. Just stick the hose end without the fitting down the sewer hole when you drain the tanks.
-An ordinary garden hose to use to flush your black tank. NOT to be used for potable water!
-Tank treatment chemical and RV toilet paper
-Leveling blocks. The "leggo" style (check Amazon) are cheap and work well.
-Tire pressure guage. You might want a small 12 volt (high pressure capable) tire inflator also. Useful to top off the tires.
-Miscellaneous tools. Your tool kit will grow...
-Spair hose clamps, duct tape, glues (super, GOOP, etc).
-Coffee maker. A Melita drip funnel - and a small pot to boil water in - works to get started.
-food, clothing, bedding (sleeping bags?), potable water to use to drink until you get a chance to sanitize your fresh water system.
I likely missed some - as stated above, Amazon is a good source.
An "overnighter" close to home will be very useful.