When it comes to flight simulator controllers, a lot depends on your level of commitment and how realistic you want the experience to be. For beginners, I recommend the Logitech Extreme 3D Pro - it's an inexpensive but functional joystick that will work with most simulators. If you want to maximize your immersion, you should look at helmets from Honeycomb or Thrustmaster, for example. Pedal-powered models, such as the Thrustmaster TFRP, are particularly impressive. They make you feel like you are piloting a real aircraft. By the way,
https://www.geekextreme.com/games-like-flight-simulator/ has useful reviews and recommendations on choosing equipment for flight simulators. You can find both budget solutions and professional systems that will satisfy even the most demanding users.