The output of the receiver is a Servo signal. The 3 pins are power and a PPM signal. To control a motor you need an ESC (electronic speed control) if you want to control the speed or a RC switch if you just want to switch the motor. I would just say to get a simpel ESC with a forward/reverse control. Because your motor has 2 wires, you do need a brushed ESC and something with a currenrange of 10A is more than enough.