wildbill,
as Dex says start by downloading and installing all the libraries first or the RTMM scenery will not display properly. It relies on scenery objects found in the various libraries.
Another thing to do is use all the resources on the site to learn about RTMM and everything available to the user. Great adventure is possible, fly a float plane to a remote location then hop into a boat and take a trip up a wild river viewing the excellent scenery of Pacific Fjords by ORBX. With CIRP you explore the vastness of the Cambria Ice Fields by ski plane or down on the ice itself with a hovercraft or Stalwart vehicle.
Take your time do it one location at a time and enjoy the trip it is worth the effort!