Hi, you should download the content examples project form the Epic Games launcher.
Head over to the Blueprint Networking chapter and go through the explanations they provide you!
Here is the documentation for said chapter:
Ohh, I now noticed that this is posted in the C++ section…
Well, to start off, asking for a complete guide on how to get character replication working is kind of pointless. There are guides already on this: A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums
You need to point to a more specific problem if you want help!
Cheers!