How To Make A Last Player Standing Game? [closed]

Ok so lately i have been making my pvp game. My pvp game idea is to make the last player alive in a specific map wins and there's a GUI showing who won. I also want to make a round system where the round system teleports players and if nobody was "The Last Player Standing" the round system will automatically teleports back players to the lobby/main menu.

For the people that can answer this long problem i will say a huge THANK YOU. Yes, I am a beginner in scripting and coding