Multiplayer GameModes

Hi to everyone I am a beginner and I want to create a multiplayer game with three game modes. For instance Team Deathmatch, Free for all and Capture the flag. I searched on the internet, but I didn’t find something, and I am a little confused because there is not so much information for this, Any help it would be awesome.

Thank you some much for your response. I would like to have those links