Maybe not the easiest game but something that I think is fairly easy to pick up is Microsoft Flight Simulator. Basically it's just a flying game as if you was flying a real airplane, no combat in the game at all.
It has a tutor in game too, so this allows you to basically be taught how to fly, you have a bit of reading but by the end of it it is worth while, as when you have finished reading for that lesson, you put that into the lesson and your tutor explains what he wants you to do and you follow his guidlines.
Once you have done that (Or you can skip that and go straight into it tbh, but at least a couple of lessons will explain some controlls) you can head into a proper flight, from Manchester to New York for example.
I would reccomend a joystick though, as using a keyboard is a bit tricky. If you want to know anything else then just let me know.
