Now you can try this:
While practicing at your RF Sim, before you take off, take your controller and randomly move the trims of the ailerons, elevator and rudder, then take off and see what happens, next, try to trim the plane so it can be flown safely, land it and then check your trims, they must be on center or near the center. This is more like a real airplane reacts.
Congrats. for your first flight.