I don't know how to go about finding relatives that can supply me with general info history, medical.

Start with who you do know and request names & addresses of other relatives. When you contact these relatives ask the same question. Before you know it you'll have an address book full of relations. Another tactic is gleaning information from family documents such as obituaries, birth notices and the like. They usually provide names and in the case of some obituaries locations (ie, daughter Jane from Toronto, ON). Then take this information and scour the phone books for any matches.