RE: Practice techniques for rudder
I would suggest flying figure eights with mostly rudder, adding just enough aileron to counter any adverse yaw (depends on wing type!)and or maintain a fairly flat turn.
Once you are fairly comfortable with a left to right flight pattern try changing directions and fly from right to left. After you have mastered both directions and can
switch directions at will (REMEMBER RUDDER ONLY) Roll to inverted and start all over . After you have mastered these you will be very comfortible with rudder.