In terms of knowledge base, the one article I recommend you read inside and out prior to the rotation is the surviving sepsis campaign (you can find this on med-line). These are guidelines for management of septic shock in the ICU that you absolutely must be familiar with, the earlier the better.
The remaining expectations are pretty intuitive:
- Show up on time (or early)
- Help your intern out as much as possible
- Read up on your patient's problems, keep up with what's going on with them
- Try to go over the plan with your resident prior to rounds if possible so your presentation sounds polished
Remember, no one expects you to know how to place a central line or manage the ventilator as a medical student on your first day. The qualities that indicate good house-staff potential are willingness to work hard, enthusiasm to learn, organization, and ability work well with others.