Name it as you like but I will suggest it naming as server.cfg.
Copy the whole thing to a text document such as notepad and save it. This is how I setup my own config for my clan.You can edit it according to your needs. I am running this config file, I found it best, as it covers most of the requirements of the server. Now for your server you are gonna need a config file.You can modify the config file according to your needs.