This doc will guide you through the basics of setting up a server on Linux and Windows.
If you want other players to be able to play on the server via internet, you have to forward a port to the server. http://portforward.com/ has a lot information on how to do this.
To configure the server you need to create a .cfg-file so that the server knows what to do. Use your favorite text editor to create a config that uses the following syntax:
setting value
setting2 value2
To find the available settings, read the Server Settings doc.
To start the server you must specify a config for it to load. This is done by adding the flag -f to the server start command, like this:
teeworlds_srv -f serverconfig.cfg
Start the command tool by pressing Win+R write cmd followed by enter, and use the command cd to navigate to the teeworlds directory.
When you get there, start the server by typing teeworlds_srv.exe -f serverconfig.cfg
where you replace serverconfig.cfg with the name of your config file.
Open up a terminal and use the command cd to enter the teeworlds directory.
To start the server, type
teeworlds_srv -f serverconfig.cfg
where you replace serverconfig.cfg with the name of your config file.
To be able to execute server commands while playing, there is a remote console. To open it, press F2 (or the key you have chosen). You will now be asked to enter a password. If the console says that there are no password, you have to set the sv_rcon_password variable to enable that. Read more about it in the Server Settings doc.
To find out what commands that are available on the server, read the Server Commands doc.
If you have any questions, read the FAQ. If you can't find an answer, please use the support forum.