I am just starting my flight training and want to utilize flight simulators to supplement my training. How do I choose one and what are some must haves?
I believe you should get as much as you can afford. We can't fully make suggestions because technology is constantly changing.
Get the best computer you can and some yoke/throttle/rudder for the controls
For flight sim have a look at Prepar3d v4 or Xplane11 which are both great simulators
I'm personally more familiar with the first one then get some add-on airplane, I would recommend A2A if you are going to P3D
After that it's a big can of worm with sceneries, weather add-ons, textures packages etc.