As most have said above fly vanilla without any community add-ons. Don’t download any of the free world updates etc until you are happy with it (or run these overnight).
You might want to look at locking the frame rate in game for a more stable experience.
Once you’ve done a couple of flights then try raising the graphics options if you want. You’ll have something to compare it against that way and see how much of a hit you take on fps.
Enjoy and have fun!