Hi Lachlan
What you want to do is quite simple. In airplane terms what you are want is to set up a 'V-Tail' mix using Rudder (Steering - CH1) and Throttle (Ch2) instead of elevator and aileron as you would with a plane.
However, most pistol grip controllers do not allow you to do such mixes. If yours does then great. Google 'V-tail' mix to find out what to do.
Without this mixing ability on your controller you would need then to look at setting up a dual motor/servo control circuit. If you are using servos as you say then you could try any of these V-tail mixers. BUT note they only work for servos and not ESCs
http://www.hobbyking.com/hobbyking/stor ... oduct=4170http://www.hobbyking.com/hobbyking/stor ... oduct=6321http://www.hobbyking.com/hobbyking/stor ... oduct=4072Hope this helps
Cheers
Kevin G