Show up on time.
Don't be lazy.
Don't be a toolbag.
Be AT LEAST 15 minutes early
Don't avoid the boss. (S)he hired you, and if orientation is not working out, tell her/him.
And do bring doughnuts once you figure out if it's allowed.
Oh, and don't be a toolbag.
If your driving on your first day, don't throw your medic around. Breaking and accelerating are the worst. I don't throw things but I've been know to fill a ear canal(my driver's that is) with D50 after I've been bounced of a bulkhead or two.
and all the above
nothing ruins pants like rogue d50