Convert xls with addresses to Google maps pins

I have very large xls sheet with thousands and thousands of addresses. They are divided into three categories. I need someone that can convert this sheet to a large Google Map with these thousands of pins. Each of the three categories needs to have a different color and when you hover over a pin you need to be able to see the title or number of the pin. The xls sheet will change in the future so I need to be able to easily import a new xls sheet myself.