For DCS, especially the warbirds you got to have a decent setup. Buy good rudders, good joystick and base, throttle is not that important. It will be expensive but you can fly the planes like it was or is in real life. In addition you hardly can stop because good hardware is such a great feel.
Crosswind pedals, virpil or vkb base and stick and thrustmaster t16000 throttle is the perfect setup in my eyes.