Hi Kulsum, welcome 
If you haven’t already, please read the forum’s FAQ How to get help on the Dynamo forums
There are many posts on getting site location and coordinates - only a search away
Based on your post you are working with a site with many linked files, say something like a housing development. Start with the file with all the links (site file?) and work with that
Have a go - use the Dynamo Primer to get an understanding of Dynamo, show us how you go