How can I add multiplayer and host the servers?

Hey People, i want to make a only multiplayer Shooter, how can i add a multiplayer Mode to ue4 and how can i Host the Servers? Thanks for your answers. If somebody s familiar with that you can join our projects, would be nice.

please view our Documentation:

https://docs.unrealengine.com/latest/INT/Programming/Gameplay/Framework/Networking/index.html

And you may be interested in the Video Tutorial Series for Networking in Blueprints:

Blueprint Networking Tutorials - Unreal Engine

Cheers and happy developing!