Be nice, and kind to all your patients, even when you are tired, upset, disgusted, angry, or disillusioned.
Do not be afraid to be blunt and harsh with the occasional patient when appropriate.
Do not think that you know everything or that medicine won't change just because you have reached the level you sought.
Treat other people from professional organizations (read cops, firefighters, nurses, doctors, etc etc) with respect.
Do not be afraid to assert yourself and stand up for your patient/what you know is right when someone from one of the above groups is not acting appropriately.
Pick your battles. You'll see and hear things that you know are wrong/innapropriate. Some must be dealt with immedietly, some don't need to be at all, and some can wait until a later time.
Don't forget that experience does not always equal actual, real knowledge.
And most importantly: you are now in a position with much more responsibility. You are in charge. You can't forget that. When things go great, it's a good feeling. But, when things go wrong, you cannot hide from the reality of your role or pretend that it doesn't matter. When that bad call comes around, do not try and ignore what happened, or pretend that you are still ok. Find someone who knows what they are doing, talk with them and get yourself sorted out.
The best providers I know are some of the most compassionate and caring people I've seen and are good about making sure their patient is cared for and get's the best help they can deliver or direct them to. And they are terrible about doing the same for themselves.
Don't let that be you.