hoosierdad

I've been simming for years, but have been flying FSX with a circa-2008 computer so I've restricted my add-ons to aircraft, plus ASN. That all changed yesterday when I bought a new rig. All of a sudden I went from 7-15 FPS to 70+. So now I'm ready to be greedy and enjoy scenery add-ons. I just don't know where to start and what the difference between them is. Mesh? Textures? Terrain? Someone tell me what I need.

Looking for a VA that provides flight assignments, particularly multiple leg ones that would simulate a trip of a real life pilot. Type of aircraft operating and location aren't particuraly important, but the more varied the better.