Ailerons are located on the trailing edge on the wing of the plane. They bank the plane left, if the left aileron is up, and right, if the right aileron is up.

The rudder is used mostly for aerobatic, like the knife edge. On aerobatic planes the rudder points the nose in the direction you point the rudder. On trainers, because of dihedral which the upward angle of the wings to make the plane more stable, causes the plane to roll slightly in the direction the rudder is pointed in.

Flaps are used for takeoff and landing. The flaps go down in increments. The provide more lift for takeoff. On landing, when the flaps are all the way down, the flaps provide more drag aand lift. It allows for quick landings and faster desent rates.

Hope this helps.