1. ON/OFF and lights; force off, lens re-attachment
2. Battery/charger/options; safety clips, 3rd party choices, AA choices
3. Memory Cards/formatting/sizes/backups; brands,
4. Buttons/locks; look for any L's - what are they for?
5. Shutter release choices: single, continuous, timer
6. Diopter adjustment; memorize it
7. Playback/Display choices
8. Lens/attachments/techniques/needs/choice: normal vs. wide example
9. Shooting techniques; hand-held, tripod; chimp
10. Lens cleaning; UV filters are a "religious argument"
    Lens cleaning info online: http://www.digital-photography-school.com/how-should-i-clean-my-dslrs-lens
11. Sensor cleaning; you need to know how even if... See this image. Demo.
    Sensor Cleaning Info online: http://www.cleaningdigitalcameras.com/methods.html
12. "Check all the white buttons"; David Tejada And I will add to carefully check your INFO screen.

When shooting:

Which buttons do you want to develop "muscle memory" for as soon as possible?

Can you quickly and safely change a lens in the dark, when its raining, in a dust storm?