Don't get hung up on "channels" or the presence or absence of a particular control surface (i.e. ailerons). Good rudder designs fly just like a plane equipped with ailerons, and will even roll with enough rudder deflection.

On any plane you get, make sure that throttle is one of the controls. There's nothing worse than having to land for whatever reason, and not being able to because you can't shut off the motor.

Check out the "Good First Planes" thread posted at the top of the Electric Training forum.