This site will show you an example of a floor map. http://www.tucsonaz.gov/dsd/Permit_Review_/Residential/Floor_Plan_Example/floor_plan_example.html
This site will show you a road map of Pennsylvania. Take a look at the map and click above it where it says "Map Legend" this will show you an example of a key for this map. For your project you will be creating your own key/legend which shows 10 symbols on the map. http://mapmachine.nationalgeographic.com/mapmachine/viewandcustomize.html?themeId=103&ext=-80.528549,39.721375,-74.698044,42.524704