1. What command are you trying to manipulate with the joystick?
2. It is castor steering. We do not have a fake fix for this real world practice. You must use rudder pedals or must set brakes to your keyboard to work the differential braking.
3. The engine code is very complex and requires it to be operated to a T, by the book. If any process in the procedure was missed it wont start. Sometimes you have to hold the starter for longer, and if you flood the engine, well you have to do a hot start to unflood it. It is a very realistic unforgiving engine.
My process in starting the engine is this:
If engine is cold and not flooded...
Mixture full forward, throttle full forward, Boost pump on forward, wait until you hear the fuel flow (pump gets audibly louder) then once you hear the change retard the throttle to idle, boost pump to Prime to 2 complete seconds, boost pump full forward again to on, crack the throttle slightly, hold the key to start, if it doesnt come right up then work the throttle back and forth as you hold the key, this will help get more fuel into the cylinders. Sometimes it takes 10 or so seconds to start depending on the weather and engine condition.
Hope this helps!