arusr:
RFM MISO = Arduino 12
RFM MOSI = Arduino 11
RFM SCK = Arduino 13
RFM GND = Arduino GND
RFM NSS = Arduino 10
RFM NC = Arduino GND
RFM 3.3V = 3.3V from voltage regulator
RFM DIO0 = Arduino 2 (interrupt I think)
NC = Not Connected/No Connection.
I would suggest do not connect to ground.