Cannonball script not changing the part's material, color etc.?

I was doing a cannonball script, but the problem is when I finished and tested it..the part didn't change at all. :/ also: is it supposed to shoot the player who clicked the cannon? or do i have to input a line of code for that? (i'm kinda new to scripting :/) for this script to somewhat work i had to put it in the part that i want to be the cannon(i also used a click detector for the "part")

Script I did:

local debounce = true
local function shoot(origin)
	if debounce then
		debounce = false
		local cannonball = Instance.new("Part")
		cannonball.Shape = Enum.PartType.Ball
		cannonball.Velocity = origin.CFrame.lookVector * 300  + Vector3.new(0, 30, 0)
		cannonball.CFrame = origin.CFrame + Vector3.new (0, 2, 0)
		cannonball.Size = Vector3.new(1.5, 1.5, 1.5)
		cannonball.Parent = workspace
		cannonball.Color = Color3.new(0, 0, 0)
		cannonball.Material = Enum.Material.Slate
		
		local fire = Instance.new("Fire")
		fire.Parent = cannonball
		fire.Size = 4
		
		cannonball.Touched:Connect(function(hit)
			local explosion = Instance.new("Explosion")
			explosion.BlastRadius = 20
			explosion.Position = cannonball.Position
			explosion.Parent = workspace
			cannonball:Destroy()
		end)
		
		game.Debris:AddItem(cannonball, 3)
		
		wait(2)
		debounce = true
	end
end

script.Parent.ClickDetector.MouseClick:Connect(function(plr)
	local head = plr.Character.Head
	shoot(head)
end)