How to create a duel system

Hi, so basically I can’t visualize on how duel system are made and I’m trying to recreate Murderers VS Sheriffs duels.

but what I have right now is information in a table, and the ability to teleport them to an available arena.

local team1 ={players}
local team2 ={players}

and I don’t know how I can use it to create a duel system