Yes, you should supply any documents that might be potentially relevant to your case. Police reports, for example, contain eyewitness accounts and details about conditions surrounding auto accidents, fires, assaults, and the like. Copies of medical reports from doctors and hospitals will describe your injuries. Information about the insurer of the person who caused the injury is extremely helpful, as are any photographs you have of the accident or of your injury. The more information you are able to give your lawyer, the easier it will be for him or her to determine if your claim will be successful. If you haven't collected any documents at the time of your first meeting, don't worry. Your lawyer will be able to help you obtain them.