An example project of how to use the ReplicationGraph in Unreal Engine. Also a template version of my ReplicationGraph is provided so you can use that in your project and create a child class from it.
Video tutorial can be found here: https://www.youtube.com/watch?v=7P11RwKfuEM
Also other useful docs:
Wiki Docs: https://docs.unrealengine.com/en-US/Engine/Networking/ReplicationGraph
Epic Livestream: https://www.youtube.com/watch?v=CDnNAAzgltw