Steph, for servo torque calculations I go to here:
http://mnbigbirds.com/Servo%20Torque%20Caculator.htm
IDK what your control surface dimensions are but the max surface deflection is 45 and 50 degrees. The max servo deflection is 60 degrees. I do the calculation for all the speeds I think the plane can do so I know what the affect of to much speed when I deploy will be (because we always make mistakes).
To do your other surfaces:
Surface max. movement will be between 10 and 20 degrees. Max servo movement on a servo will be 30 degrees. Just as examples, so you can see the stress on your other surfaces/servos.
My rule of thumb is A,E,R 1.5x what this shows if run by two servos, 2x if run by 1. Flaps are best fit and be mind full of when you are close to stalling the servo.
Joe