Why don't you give us more info, like the name and model aircraft you have, as well as the size (wing span and so on). But, basically, yes, you do center the control surface and the servo arms and go from there. You don't want to get to carried away with throws, though, and that's where more info on the model will help. A lot say "3/8 inch up and down" others may say 1/2 inch.. depends. But, I would stay away from dual rates, if that's what you may be headed with this question.... at least until you fly the plane a few times with the throws you DO use.

CGr.