Leaderboard Help!

Okay... I think I have a basic idea. So like you said, I will refer to the teams as Red, Blue, and Green. I will use a TeamColor (BrickColor) for the team colors.

Your script looks good so far, but in order to find the player that was killed, you need to go into the weapon bulletscript (the one that clones INTO the bullet) and add something like this:

local red = BrickColor.new("Bright red")
local blue = BrickColor.new("Bright blue")
local green = BrickColor.new("Bright green")

local bullet = script.Parent

bullet.Touched:connect(function (part)

    Cash_To_Add = 5

    local char = part.Parent -- Easy to get the character.

    local playertouched = game.Players:GetPlayerFromCharacter(part.Parent.Name) --Find the  player instance of the person hit.

    --Bad way to do this, but add a code into the shooter (that controls the clone of this script, shown later)

    local charthatshot = script.Parent.SHOOTER.Value
    local findchar = game.Workspace:findFirstChild(charthatshot)

    if findchar ~= nil then
        local shootingPlayer = game.Players:GetPlayerFromCharacter(findChar.Name)
        local stats = shootingPlayer:findFirstChild("leaderstats")
        if stats ~= nil then
            local money = stats:findFirstChild("Cash")
        end
        if shootingPlayer.TeamColor.Name == red then
            if playertouched.TeamColor.Name == blue and char.Humanoid.Health == 0 then
                money.Value = money.Value + Cash_To_Add 
            elseif playertouched.TeamColor.Name == green
                money.Value = money.Value + 0
            end
        elseif shootingPlayer.TeamColor.Name == blue then
            --Do what is above except your own conditions.
        end
    end
end)

EDIT TO ABOVE: Fixed something: TeamColor itself is not a text value or a number value like brickcolor, so I fixed it by saying "TeamColor.Name" because that returns a text value.

Because there is that SHOOTER value on line 20 that I said you needed to make, here is the script to put into the shooter script (Like PaintballShooter in the Linked ROBLOX paintball gun)

--Put this code seen below inside of the onActivated() function.

local shooter = Instance.new("StringValue")
shooter.Value = Tool.Parent.Name
shooter.Parent = bullet --Make sure this is AFTER the part in the function where it says this:
shooter.Name = "SHOOTER"

--"bullet.Parent = game.Workspace" or something.

I know it is an (Time for my favorite line!) in-efficient, but working script, so I hope it works for you. Tell me if I messed up on anything!

--XanthicDragon, a fellow minor developer on ROBLOX