Hello!
The server template should launch a console window and start a server try launching it from a command prompt window. The configuration for the server is determined from a config file located in
%appdata%/Godot/app_userdata/SLTwo
You will also need to port forward the server in order for other people to be able to join. If you wanted to have the server on the list, there is a few extra steps and requirements for that to happen.
Hope this helps!