Chris, congratulations on your purchase. The pic below is of my car and where I cut patterns for and installed the 3M Pro Series PPF myself. The solid red areas are what I feel are mandatory and the dash as optional, but recommended. I have about 3000 miles on mine since late Aug including driving through some heavy downpours so I kept an eye on where the water/dirt splatters along the sill and rear clam areas before committing to a specific pattern. At least on mine, the areas that get blasted the most are the front sill area immediately behind the front tires and the rear sill/clam area. So much so that I will be applying a second "sacrificial" layer in the lower rear rocker/sill. Word of caution: If you do plan to remove the top layer at a later time, you will need to first apply a few coats of wax before applying the "sacrificial" PPF layer or it will permanently bond to the bottom film defeating its purpose. Those front Avons will let go of pebbles at a pretty high muzzle velocity!
Another thing to consider is track use. If you have decals in that lower sill area, the sticky tires will eject hot molten rubber and you'll eventually have to clean it off. Most cleaners aggressive enough can remove the ink on the decals so consider protective film to go over these, too. That's why I extended my PPF over the sill stripe and flag emblem...
Aside from the obvious nose protection areas noted earlier. I have decided to cover all of the access panel over the winter. I find myself removing and replacing this piece quite often and I think in the long run the PPF will keep it looking consistent vs covering up to the lip and smaller pieces cut around the DZUS fasteners.