This is the controller configuration and NO you do not have to calibrate it but you probably can. Also, you do need a sensor bar.

for the Nunchuk Attachment (which you should definitely purchase)
it has one analog stick on the front, some motion sensing abilities a small C button on the top of the back, and a larger Z button below that. You hold it with your thumb on the analog stick and then you have 1 finger on the C button. When I first started I had a finger on the C and a finer on the Z and my Z button finger (my middle finger) got sore.
