Don't set the model for game controller mode. You would use that if you were going to connect your NX10 to the computer with a USB cable. It turns off the radio and makes the NX10 look like a game controller to Windows.
To go wireless with the WS2000, the NX10 should think it's talking to any other aircraft receiver. The WS2000 is basically a receiver on a USB stick.
For what it's worth, the WS2000 is limited to 8 channels. If you were to plug the NX10 in via USB, you'd get 10 channels. Something to keep in mind if you get to a point where you'd like one more switch to control something in RealFlight.