I have tried creating environments in Blender and other 3D programs.  Usually it involved a lot of time and effort and resulted in frustration.  Part of my problem was that I tried to create too much of the world that was never to be seen by the camera, leading me to my Lessons Learned #1.  I've recently experimented with two Blender add-ons that make the process easier; BlenderGIS and Mirage.  They each have their strengths, depending on what you want to do.