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Make sure you have the correct "long" B27 targets, not the "short" or "econ" versions that some places sell (and don't always clearly identify).

I created a couple of checklists for my own use:
1. A checklist of all the materials I need for a class (all the things you mentioned, and anything else you might add over time). Before each new class, I print out a copy just for that class and physically check things off, to make sure I didn't forget something.

2. A checklist that breaks down the shooting proficiency into individual strings - what distance, how many shots, how many seconds. I find it very easy to lose track of how many shots have been taken when I'm also watching all of the shooters, so the checklist makes it simple.

You might also want a stopwatch or a timer with a loud enough "beep" that it can be heard by those wearing ear protection. I've only had one student really get close to the time limits, but it's good to have something to measure them by, just in case.