The first step you can do is get set up with the Google Maps API https://developers.google.com/maps/documentation/javascript/tutorial - If you don't have latitude and longitude data you will need to choose a geocoder, google has one https://developers.google.com/maps/documentation/geocoding/ and from there you can set those lat/longs into the google map with markers with something like
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title:"My Map!"
});
Hope this helps.
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