Spending the night in the driveway and/or Walmart are both good ideas. My tendency is to overthink things, and try to anticipate every detail - wrong!
A lot depends on what you like to do, and how you normally live. The advice above is good. Pack like you were going on a short vacation, then add things as you find you need them. You only have limited storage space, and if it gets jammed full of stuff you seldom use, it becomes a bother to move all the stuff to get to what you really need.
2012 Keystone Outback 277RL (Salty Doghouse II)
2005 Ford/Quigley E350 4x4 Van 6.0L Diesel (Moby)
Molson (goldendoodle-11yrs) & Zeke (parti poodle-6mos)