Unimog Club UK

Hello Dan welcome to the club very nice find you have there.if it's all standard you put the key in don't turn it that should bring some light on your dash there should be a pepper pot to the left and a pull knob to the left of the ignition pull this out until you can feel resistance and after 20 second the pepper pot should glow red, these engines rely heavily on the glow plugs so depending on tempature any where from 20 to 60 secs then pull said knob to crank engine over.
If it's very cold or the is something wrong with the pump stop push this in as cranking this will increase fuel you don't need to touch the throttle.
Moose