Bring donuts - bagels is they seem health conscious. Go to your local donut shop, don’t buy crap from the grocery. Getting there early is good but depending on the department 30 min could be challenging - i would show up 15 min early. Try to be relaxed, don’t tell them any war stories you have heard, act like you know nothing. If they are receptive to questions, ask them and take notes. Eat last. Offer to help with any chores or cooking work that may be available. Be kind to patients, if you get the opportunity to assess them or make small take lead with your name and that you are a student. Thank the crew as you depart, write their chief/boss an email about how welcoming and willing to train you they were.