^ I agree with the post above. Don't be afraid to ask any questions that you have about the program, school or supervisor. Current students will be one of the best sources of information about how well you will fit in there. In my experience when talking with students they are usually more than happy to answer questions you may have.
A couple questions I have asked was what has your experience been like working with 'x' supervisor. What sort of opportunities/projects have you gotten the chance to work on. What is it like attending 'x' university, you can also ask about classes you would potentially take and what the typical schedule is like. Even asking about living situations is also good to get a sense of where to live (if you are out of area of course). Showing interest in what the current students are studying also doesn't hurt. I think the more specific your questions are the better and I'm sure more questions may arise from conversation.
Good luck, and congrats on the acceptance!
