Google Map with custom MapType for Game

There are 2 main requirements for this task 1) Create a custom map using the provided image 2) The ability to create a marker on that map that links to an image uploaded at the time of making the marker Basically I want someone to be able to take a screenshot in the game, and then create a custom marker and upload the screenshot so that the marker links to it. I would like to be able to add/remove the markers easily, and update the image associated with the markers. I will need to support approximately 50 markers or less. I wish to have a map generated off of the sample image (no need to zoom). I am not experienced with web site and/or web design, but I am requesting a demo of this capability and a copy of the code used to create it.