Can't figure out how to damage NPC and get KO with "no handle" tool? [closed]

The problem I'm having is that when I use the punching tool, I want it to damage the NPC only when I left click. And the other problem I'm having is that I have no idea how to increase the amount of KOs on the leaderboard after I [successfully] kill an NPC (and I have a KO counter script already implemented into the NPC which gives a KO if I kill the NPC with another weapon, such as a sword). Keep in mind I'm using a tool with no handle.

What I have so far is my animation portion.

local plr = game.Players.LocalPlayer
local char = plr.Character or plr.CharacterAdded:wait()
local tool = script.Parent
local swingsound = tool:WaitForChild("Swing")


tool.Activated:connect(function()
    local choose = math.random(1,3)

    if choose == 1 then
        local swing1animation = script.Parent.Parent.Humanoid:LoadAnimation(script.Punch1)
        swingsound:Play()
        swing1animation:Play()
    elseif choose == 2 then
        local swing2animation = script.Parent.Parent.Humanoid:LoadAnimation(script.Punch2)
        swingsound:Play()
        swing2animation:Play()
    elseif choose == 3 then
        local swing3animation = script.Parent.Parent.Humanoid:LoadAnimation(script.Punch3)
        swingsound:Play()
        swing3animation:Play()
    end
end)

tool.Unequipped:connect(function()
    local hum = char:WaitForChild("Humanoid")
end)