Hi all, relatively new to CNC machining and have what some very beginner questions.

Assuming I have the smooth stepper USB or ethernet controller what else do I need?

1) I read of people using breakout boards in conjunction with the SS, why is that necessary?
2) I'm assuming I still need the drivers to run the motors?
3) What is the purpose of the 5v power supply if it can already be supplied by the USB cable?

Lastly, what is the advantage of the smooth stepper other than getting rid of the need for a parallel port?

Thanks in advance,
IK