The fun part is coming!
Now that you are down to your last bit of planning....
when you are reading the Milepost, you will find different listings of some fun things to do. when my wife and I were planning our trip, I put some sticky notes out the side edge (to be easy to find) when I read something I thought was fun, my wife did the same. An easy way to plan for some enjoyment as well as enjoy what you find as you go.
I had access to an old Milepost (but you can do the same by copying) and made copies of maps for particular segments of the trip. I could see the big picture layout with the current day map in a tankbag, and keep my Zumo set to a tighter frame.
you are going to have a blast, enjoy!