I also use Family Search to research sources and am very familiar with the layout. If you can give me an ancestor I can find out there (perhaps a grandfather, or all 4 of your grandfathers would be even better?) then I might be able to help you in your search. We have an extensive number of profiles out there, and in most cases, a connector or family member has been able to successfully find a link to someone on the tree.
You will need to add your branch to the tree, at least any that are not currently added, but it does open up your branch to the global tree and all its connections, which is very nice. Please let us know if you need any help or we can provide assistance that will help you out.