Build and Shoot

Hello guys,
Im haveing trouble trying to find info on how to make a private server. I want to make a server just for me and my friends so aparently i have to make it stop broadcasting or something, but i cant find how to stop that. ¿any help?

If you're using pysnip do one of these:
1. Login to admin in-game and do /master
2. Go into the console and do /master
3. Go into the config, and set master to false.

Hm... you can always use hamachi for a private private server instead of a private one. Also what gamemode I'm just curious if it's build can I be in it xD