Congrats on your new camper!Fun times are ahead of you!
Insurance: Whoever you insure your automobile with, use them. While attached to your tow vehicle, you are covered, same as your tow vehicle. You'll need a separate rider policy for the camper for when you are not hitched up, against fire, theft, hail, tornado, and high rising rivers! Your best rates will be with your current insurance carrier.
Jacks? That is the topic of the century! Lots of answers, everyone has their own preferance. Personally, we just use the stabelizer jacks that came with the camper and don't mind some trailer rocking. No biggie. If you were on a boat, you'd get a LOT more! But.... JT Strongarms are probably the best solution once they are installed on your camper.
Generator? I have a gasoline powered generator, that I've never used for camping since we only camp at campgrounds that have electricity. We don't boomdock. If you are camping in established campgrounds, you won't need a generator.
Get a weight distribution hitch for your new rig. There are many varieties and prices "out there". Get what makes the most sense to you. Personally, we had a normal Reese system with the bars that had chains on the end. Used it for 10 years on 3 trailers. Then the hitch head bent, and we got the 4 point Equal-i-zer. Blue Ox, Reese Dual Cam, Equal-i-zer all are good and perform about equal after reading thousands of reviews on RV.net about each one.
Good luck! Try some drive way camping. Hook up the electric and plug in the television right in your drive way. Throw some sheets on the bed, and sleep in it tonight!
Once again! Congrats!