If you don’t already have an appointment, ask to meet with your advisor / contact / manager at the company on the first day of your placement. This is the person responsible for giving you all the pertinent information about your work placement. Feel free to ask him/her any questions that you may find necessary so that you can be effective at the company and fit in well with your team. The more general (or non-existent) your agreement, the more questions you will need to ask on your first day. Make sure everything is clear and precise with no room for ambiguity.