Google Map Plugin for Joomla

I have installed the Google Maps plugin for Joomla 1.5 but am having trouble getting the map to appear in my articles. ? I need you to set it up so that I can plot multiple points on the map (using Google MyMaps or KML file). ? I don't have all the points that need to be mapped right now, so you may just set up dummy points and tell me how I can swap in the right points when they are determined.