Regular PWM dont work, Servo Library dont work, does it work with the receiver as of NOW. If it does then i'm stumped, there is no reason why this motor should not work properly.
try the example again and this time dont change anything just plug in the servoS, yes both! If the regular servo works with the code then the motor should work too.
If not then I can no longer help you im sorry.
If you're powering the Arduino through Vin you need to provide at least 7V. If the V+ from the speed controller supplies a regulated 5V then you could connect it directly to the Arduino 5V line and power it like that.
Using the Servo library, I suggest you use write(angle) rather than writeMicroseconds(microseconds).
I didn't realise that the forum's alignment codes would affect stuff in [ code ] blocks too but it seems to, so it would probably be best to make sure any code you post is left aligned in future - the center alignment doesn't work at all well for code.
There probably is an "arming" sequence to allow the control of the motor. You don't want the car to take off as soon as you plug the power in.