Google Maps/Earth Network Diagram

I require someone who is familiar with Google Maps/Earth (not sure which one would work best for my requirements so need guidance in this as well). I would like to be able to? use a spreadsheet of locations (long/lat) and some other details (bandwidth, equipment, status, etc.) to map a network diagram onto Google maps. I need the site labelled with the information and a line drawn to connected site/s. The high level map would show mapped cities/towns and network betwene these. Then you can click on a city/town and it will show sites etc. So some drill down capability. I need to know how I can easily create the overlay files for above. I also need to know how I can easily capture co-ordinates (long/lat (I believe this is required)) for a large number of sites without having to call each of these up in Google and log the co-ordnates. Initially I require some input and ideas and I am happy to pay for this. I am also happy to pay the person who dispalys that they can do this to do development / create processes, etc. to make the project a reality. This would be by negotiation and I expect I would list a seperate project for this. Please send me details of your experience with Google Maps/Earth and any high level information that will enable me to guage that you are a suitable candidate for this project.