How do I make a dedicated server?

Im not even nearly done with my project and I only used blueprints. How can I make a dedicated server and a client that can connect to the server ? I searched a lot and saw a lot of guides and videos but none of seems to work. Can somebody help me out.
Im using 4.7.6

Thanks for help

You need to set up a special server target for UnrealBuildTool.

This tutorial explains the basics, but you can use console commands to start up a server.