Not much to it. Pretty easy money. 90% of the ODC clerk job is very simple, just like Frigid said, but when there is a problem with a shipment, it can be a pain in the buttcheek to figure out sometimes.
I was a backup ODC until I went driving so whenever I covered for the regular person while they were on vacation, I would have at least one shipment a week that would be a pain to deal with, or you would have some 'keyed not imaged' show up on your final report or a package where you scanned the invoice and didn't key in your initials cuz you were in a hurry. So you would have to fix your screw-ups too.