Well, there isn't a lot to know about it so really a 4-page instruction booklet is probably enough.
Plug it in and the tank will fill to maximum pressure, which will be somewhere around 100psi but probably a little bit less. I don't see an on/off switch however that might be what the red cap on top of the pressure switch housing is for. I can't tell from the pix. When it gets to max pressure the motor should shut off.
On the outlet, there is a red handle. That is NOT the regulator it is a air valve and can be used to turn airflow on or off. Right below the gauge in the 4th picture is a brass knob that appears to be labeled "Max" and "Min". That would be the regulator knob and would be used to adjust the outlet pressure.
As you use air, the motor should cycle on and off to keep the tank pressurized. When you are finished for the day, bleed the tank (turn the power off, close the air valve, disconnect your airbrush, and crack the air valve open to let the pressure bleed down). Once pressure is down very low (say around 15 psi) based on the pressure gauge mounted on the tank itself, close the air valve, and open the drain on the bottom to let water drain out.
I'm not wild about that regulator, and don't know how consistant your airflow will stay. If the pressure varies, open it up wide and put another regulator on the end of the outlet.
I agree that you need a moisture trap, but as to whether the Aztek takes 1/4" NPT connections I have no idea.