Hello Inferno !
Warm welcome !
With all the equipment you managed to gather, you're close to the success
Be cautious :You will have first to
test the correct wiring of your pot and motors before any attempt with Xsim !
Once the reverse and forward motors way will be correct, you will attache the pot on the motor
and then send tests via Arduino's serial monitor : finding min and max for your hardware configuration
and only after that running Xsim !
You'll find detailed explanation in my tutorial post here :
http://www.x-sim.de/forum/viewtopic.php?f=37&t=943Mat