Hey bork[e]....here's the only place you'll need to visit for getting planes, missions and other crap to fill out FSX:
Clicky You'll have to sign up but who cares. They have a bunch of forums there for other info if you'll need it. You'll find everything from concept aircraft to the fucking Battlestar Galactica to fly. I've flown the Dropship from Halo and that fucker moves at Mach 6...so don't fly too low through the Alps in that cunt.
Here's another site for getting flight sim stuff but I haven't looked around it too much:
Clicky
Here's a quick tweak guide to help direct you to the correct files to fuck up...er...adjust to get better performance:
Clicky. The most powerful tweaks you can do is regarding the autogen objects (trees, buildings, etc) and replacing the tree textures and cloud textures for better performance.
Here's another tweak guide that pretty much covers everything the first tweak guide does but it's not a .pdf bullshit fagg0try page:
Clicky
Here's the FSX SDK:
Clicky for making your own missions, etc. I'm seriously thinking of creating some helicopter rescue missions. I've completed all the advanced helicopter missions in FSX (and a couple of missions created by users) and I need something new.
BTW...to find the FSX.config file you'll need to make sure that hidden files and folders are visible.
Have fun and don't forget during a landing to deploy the spoilers AFTER your wheels touch down. And try the heli missions....it's a whole different way of flying.