Put it together - run the first nut down until you eliminate all play in the wheel bearing (weight off the wheel, brakes backed off). The drum/hub should spin freely with no play in the bearing. The nut should be just hand-snug. Next install the jam nut - run it down until you feel a sharp increase in torque and stop.
You'll go blind trying to figure out how to do this with a torque wrench. My gut tells me that you probably shouldn't even be messing with it if you have to ask this question though. Good luck.
