Small signal model for Mosfet...unsure as to whether its common drain, gate or source
It is a common gate amplifier. The input ( small signal) is being applied at the source and is measured at the drain. 

I know in small signal the capacitors will act as shorts.. but from there I am pretty lost in the schematic

-- This is not correct. The capacitors will act as shorts at high frequency and is not dependent on the small signal model usage. 

Hope that helps.