Sandra, the easiest way to use a Google Earth image in ArcMap is to set up the view in GE the way you want to use it and export as a jpg image. (File...Save....Save Image....)
In ArcMap, import the jpg image in exactly the way you would add a layer or raster image, through the 'Add Data' dialog box. If you want to use the imported image as-is, with no additional references, no georeferencing is necessary; ArcMap will display the image, even without a prj file attached.
If you want to view it in its actual position, you will need to georeference it.
The light ring circles and any labels required can be added directly with the draw tools included in ArcMap, either in the Data Frame or Layout view. (Toolbars.....Draw)
Bill; GIS Analyst
Actually, yo can do it all in ArcMap, without using any addtl extensions. First create a table of your office locations with the street address, city, state and ZIP in separate fileds. You can have other fields like office name, or whatever you want too. If you're using 9.2 it will take an excel file, otherwise create it as a DBF, or in MS ACCESS (or a geodatabase - though not as easy as Ecel or Access for a small list like you have). Then add that table using the "add data" button. Nest use tools>geocode, sleect one of the geocoding tools that comes with arcmap. It uses the Teleatlas / StreetMap USA layer to geocode. It's pretty accurate. Alternately, you do a find>address for each and get the lat & lon from that, add that you your table, then bring the table in as an X / Y layer.
To get your buffers, use the proximity tools in arctoolbox and you can create a buffer in whatever units you like (feet, miles, etc) for the locations you added above.
Geographer, Buffalo, NY
Although you may want to use gis software, it sounds as though you want to focus on lighting. For that I would suggest that you use lighting analysis software such as Visual. The 60' circles that you want to portray appears as you may want to show a certain level of footcandles (light levels). Visual is reasonably priced at $100. USD.