This is what I have to do to keep track of times and exposures on night photo forays. No EXIF data for me. As you can see, sometimes there are dud shots and screw ups so it's really fun getting the film back and trying to see where the offsets are. That in mind, I started writing down what I shot as a reference. Last shoot was the most confusing, I had 160T and 50 film then was tossed a roll of 400... errr who said we wouldn't need math?
Another important tip, flairs are just a bad idea - use ball point or anything that won't RUN if it gets WET... that's just a bad accident waiting to happen. You'll see grown men (or women) cry.