This is an area where Filemaker and Filemaker Go are lacking. The topic is talked about in the sync guide. Filemaker Go does not have syncing built in. The Guide is not real good and there are no examples files. http://www.filemaker.com/company/contact/feature_request.html.
SeedCode has a Sync program but it is expensive. You can download a free version that syncs one table, which is worth looking at evening if you decide not to purchase. http://www.seedcode.com/filemaker-sync-gozync/
The common method recommended is to have the user fill out the layout on the device, then sync to the server and have a check method that verifies that the sync has completed.
I know user have been asking for sync capability for sometime now but maybe one day they will get enough request and add it. Here is a link for feature request. http://www.filemaker.com/company/contact/feature_request.html