How to make a local Kill/Death gui?

I'm trying to figure out how to make a gui that locally gives the player information about their kills and death. I'm making it for a war group so I want to incorporate an overall kills for the team they're on as well.

I'm trying not to use the leaderboard (Linked leaderboard) as I want to maintain the realism.
Any help starting off and even anyone able to teach me would be perfect.

You mean a separate GUI that just records the kills and deaths a player gets? The easiest way is to set a leaderboard regardless, however have the playerlist invisible in-game then record the kills and deaths on a GUI;

Something along the lines of a local script in a textlabel would work, just rough code but nontheless should work;

Local script in a textlabel:

 repeat wait() until game.Players.LocalPlayer.Character ~= nil
   player = game.Players.LocalPlayer
    kills = player.leaderstats.KOs
    deaths = player.leaderstats.Deaths --change KOs and Deaths to leaderboard values
    
while true do wait() --very easy and ineffecient loop, but something better could be used
script.Parent.Text = player.leaderstats.STAT.Value --change stat to the leaderboard stat you wanted displayed
end --and that's it.

EDIT: If you want kills and deaths to save you will need to look up datastores. All this GUI will do is display the current leaderboard stats, nothing more.