L&D/PP Practicum!! :]

I am so very excited to actually get to post this and ask for advice because I have FINALLY been given the final word that my senior practicum for nursing school will be in L&D (with floats to postpartum floor if L&D is slow, I guess) which is what I was crossing my fingers and waiting with bated breath for. SO, this being said, I do not have a mentor and probably will not have a mentor assigned to me until the first day of practicum (for some reason), so FIRST of all, I guess I want to know what any mentors/preceptors who have had practicum students recommend to be reviewed prior to the start of practicum and what concepts are the most important for me to know? Besides the obvious "be willing to learn and do anything" mentality, what did stellar practicum students in the past do to impress you? What sort of expectations do you have for practicum students in terms of "flying solo"? And things I am supposed to be asking my mentor before practicum starts are the top five medications, treatments, diagnoses, lab values, skills and pain medications to be aware of. I know this may vary from unit to unit, but any advice you can give would be VERY appreciated. I am so excited to learn and to be in the specialty that I enjoy the most!! Thanks so much.