Can someone help with a pvp code, i thinking it should be a button that you can click in-game that makes other players that have activated pvp to be able to kill you. Also is there a way i can add an image to it so when a player activates it other players would know aswell. Like two small swords surrounding the players name, or something like that. Or the word PVP on the top left of the players icon.

And also is there a way that i could make a verb that if i click it in-game it will make the whole server a pvp server so anyone and everyone can kill each other?

And if i was to make it that certain areas on the map where NON-PVP areas, how would i do that?