Some are assigned PF numbers that are not developed yet. They are reserved for Kim Gowney scenery locations when I have the time to develop them. Someday.
Soon I hope.
Best advice I have for your experience. Don't rush things. Take one scenery area at a time, Misty's Place, and make sure that is set up and working good. Fly around that area, check things out, enjoy it. Then land. Pick another one, look at the map that's included in the zipfile and get an idea where it's at. Install it, check it out, take your time, you know, a pattern is developing here.
Then you'll have all the stuff eventually and you won't miss a thing.
Take the time and read the documentation, enjoy your new location and welcome to RTMM.
Glad to have you here.
Brad