You didn't mention the MOSFET, so it's hard to know.
There should already be models in B2 Spice (or PSpice) for a variety of
n-channel MOSFETs.  If you are just learning, maybe it would be more
valuable to use graphical techniques based upon the manufacturer's
characteristic curves, where you can plot Id versus Vds.  You will want to
DC bias at the Q-point, near the middle of the saturation region of the
selected device.  You will have to select Spice models for a drain resistor
as well as input coupling capacitors to achieve the desired impedances.
Experiment with the amplifier operating into open circuit and into a 50 ohm
load.  When you've accomplished that, press your tongue across a
full-charged 80000 mfd electrolytic.