All good advice above. Another consideration is that the amount of movement of the tail wheel should be less than the movement of the rudder. The tail wheel in contact with the ground provides for a higher degree of positive steering control that the rudder does with just air moving over it, particularly at take off speeds. For instance, if the rudder is set to move +/- 25 degrees, the tail wheel should be set to move only about 2/3s as much or about 16 degrees. This way, when the plane rotates and the tail wheel lifts off the ground, the rudder authority is comparable to what the tail wheel authority was. If the plane still yaws left upon rotation, reduce the tail wheel throw some more. If the plane yaws right, increase the tail wheel throw. Unfortunately, many tail dragger ARFs don't provide for separately adjustable tail wheels which make them unnecessarily unruly on take off.