This will not be easy to achieve in WordPress. What you’re talking about doing is created custom search to search a custom field, but instead of a form to have urls for each custom field value. While not impossible to do on your own, you’d be better off finding an existing search plugin that will let you do it.
quick search
https://www.google.com/search?q=wordpress+search+custom+fields&ie=utf-8&oe=utf-8
If you want to be able to do this on your own I’d suggest using a custom taxonomy rather that a custom field. With a custom taxonomy you can create an archive page in WP the includes a standard WP URL to display the archive for each value.
