Ask non-stop questions, be crazy cheery on Monday mornings, run around pretending like you have a ton of free time to exercise and do random non-resident stuff, become a powerpoint ranger and then pretend like your powerpoint is "crappy"..
Sorry, sarcasm.
Be humble, try to learn as much as you can, expect to have tough days (and learn how to cope with these days like a professional), engage in questions after attempting to look it up yourself, be very familiar with your cases and be ready to answer any question a mentor might have about what you are about to do.