1. I am also non-trad and just put down the supervisors names that I remembered as well as the phone number of the company. Best I can do not going to be able to track people down, and I doubt they will call anyone unless you put something on there that doesn't add up. For a few of my jobs I didn't put supervisor or contact information if they were very old.
2. The order doesn't matter they will automatically sort into chronological order themselves.