Number of poles = RPM ie: 2pole = 3600rpm; 4pole = 1800 rpm 8pole = 900rpm to get 60 Hertz
Number of windings per coil = Voltage
If Generating and using pure AC I'd suggest 3 phases at either 440v or 600V most common grid transformers, keep in mind transformers are not cheap no matter how you slice it!
if below 300 feet then a simple 2 phase at 240v will be more then sufficient with a centre tap