sterk03

I have purchased a new Dell computer and running FSX-SE and want to install scenery correctly. I read an old post about insertion points and need a little help explaining them and how to properly install Orbx scenery in the scenery library. Most will be from Orbx but so many items and where do they go. Also steam has 3rd party items also where do they get installed also in the Scenery ladder? New at this so take it easy on me I just want to install items correctly after learning on FSX. Thanks in advance. Sterk03