I am making a new game mode need ideas

`I am making a game mode and i need help with ideas.
The game mode is that you build a base and you have to make it so you will be able to survive a nuclear blast, and after the blast you need to go and fight or group up and raid, kill, help, other people. I don’t know how long one round should last, what addons to use, what maps to use, how strong the blast should be or what jobs there should be. I also need help with lua i only know a little bit of lua so if anyone wants to help that would be awesome.

If your making a gamemode you don’t use any addons.

i mean for guns or props