Current monitor

I would appreciate any help on the following:

I am helping my son with a school project. The idea is to use a windmill that generates enough power to turn an LED on (Thames & Kosmos Wind Power 2.0) to read and display the power level (voltage and current) as it goes from 0 to highest speed.

How could this be done? I have Arduino Uno and the display.
What sensor module do I need to purchase?

Thanks,
bahman