Will obviously repeat what others have said, but will do my own sort of 'complete' 2 cents. Been involved with teaching medical students in one way or another for the last decade. The majority of people were on surgical clerkships and more recently mostly MS4s on Sub-Is.
#1 Expectations - I meet with the students at the start of the rotation. I tell them that I expect them to get a lot of my rotation regardless of who they are or what their career aspirations may be. First, the general stuff, I expect everyone to be on time. I show up early, I expect them to show up early. I expect that if there is nothing going on, that they should leave and be doing something else. I expect that they will roll with the punches as in, vascular surgery is notoriously unpredictable and sometimes that means that their schedules are going to be unpredictable and sometimes unequal. I make an effort to be fair and pragmatic, but I am far from perfect and there are things beyond my control.
I expect that all students put in time and effort into their morning rounds. I try to avoid students of any level seeing more than 3-4 patients in the morning. I expect the students to budget time appropriately and show up early enough to get their patient's seen and numbers collected. I expect them to learn from previous days how long they take and adjust accordingly. I expect all students to have a plan for the patient that day. I don't care if you are a new MS3 or not, you learn by putting things together yourself, not being told. I will spend time developing that skill with you, but I won't spoon feed it to you.
#2 Procedures - I expect all students rotating with me to have knots all over their scrub bottoms. I expect that you have the basics of suturing down before you show up in the OR. If you don't, I will go over things with you after you watch certain requisite youtube videos. I will give you endless suture, grafts, and instruments outside of the OR. I am comfortable with students doing good portions of surgeries with me. I will hand the prolene over to students and let them sew portions of anastamoses or ligate things. I will leave students alone in the OR to close skin. (with a scrub that I trust assisting them and watching them, and always coming back to check on them). Everything is a stepwise process. The more you scrub and the more prepared you are, the more you are going to do. I will talk your head off in the OR. I think that I have a lot to teach in every case that I do. But, I'm not going to teach things that I know can be learned outside of the OR. That is simply not fair to my patient. If you are interested in learning to place central lines, I expect that after a month on our service, you would feel comfortable placing a line by yourself, MS3 or 4. I expect that you will watch the requisite youtube video, watch a resident place a line, assist with the back table on 2-3 lines, do everything but puncture in another 2 or so lines and then on the 5th or 6th be attempting ultrasound guided puncture. Since I was a PGY3, I have always allowed students to do the lines with me. Bottom line, I make it clear, you get what you put in.
#3 Pimping - I hate pimping. I like asking questions and discussing things. If something is a "what am I thinking?" kind of question, I will tell them so and move on quickly. There is a tremendous amount of book knowledge that you must accrue, but I don't think there is a ton of utility in testing it on the fly at random moments. I prefer questions that I hope will stimulate students to recognize what is going on in front of them or focus them on important details of what we are doing.
#4 Feedback - I try to ask students after a couple weeks how they are doing. In person I tend to give point blank, brutal honesty feedback. My mantra is that all of them should be chasing perfection, but also realize that it is impossible to achieve. I think that I was a really good MS3, MS4, intern, junior resident and senior resident. But, I take more pride in my students becoming better than I was at each of those steps. "Only a man exceedingly proud and vain, would believe that his heir should be like himself, rather than like who he wished that he could be." For formal feedback, unless someone is terrible, I tend to be generous with the number grading, knowing that it matters little.
The caveat to all of this is that I am in a surgical sub-specialty. And because of where I am and have been, the majority of students I interact with choose to be where they are rotating, rather than forced as a part of a clerkship.