How to make a gun make bullet holes?

I am currently working on a pistol, and I'm wondering on how I can add a bullet hole portion to this script. Basically, it'll make a bullet hole wherever the bullet hits on impact, except for parts within humanoid models, which will be another texture. If someone can help me, it'd be a lot of help. Thanks!

Tool = script.Parent



colors = {26,}



function fire(v)

if (script.Parent.AmmoScript.Clip.Value == 0) then return 
    end 
    script.Parent.AmmoScript.Clip.Value = script.Parent.AmmoScript.Clip.Value - 1
    print(Ammo)



    Tool.Handle.Fire:play()
Tool.Parent.Torso:findFirstChild("Right Shoulder").CurrentAngle = 2




    local vCharacter = Tool.Parent

    local vPlayer = game.Players:playerFromCharacter(vCharacter)



    local missile = Instance.new("Part")








    local spawnPos = vCharacter.PrimaryPart.Position







    spawnPos  = spawnPos + (v * 8)



    missile.Position = spawnPos

    missile.Size = Vector3.new(1,1,1)

    missile.Velocity = v * 200 + Vector3.new(math.random(-1,0),math.random(-1,0),math.random(-1,0))

    missile.BrickColor = BrickColor.new(colors[math.random(1, #colors)])

    missile.Shape = 0.5

    missile.BottomSurface = 0

    missile.TopSurface = 0

    missile.Name = "Bullet"

    missile.Elasticity = 0

    missile.Reflectance = .1

    missile.Friction = .3




    local force = Instance.new("BodyForce")

    force.force = Vector3.new(0,100,0)

    force.Parent = missile



    Tool.BrickCleanup:clone().Parent = missile

local new_mesh = script.Parent.Bullet:clone()
    new_mesh.Parent = missile


    local new_script = script.Parent.Paintball:clone()

    new_script.Disabled = false

    new_script.Parent = missile


    local creator_tag = Instance.new("ObjectValue")

    creator_tag.Value = vPlayer

    creator_tag.Name = "creator"

    creator_tag.Parent = missile







    missile.Parent = game.Workspace



end







Tool.Enabled = true

function onActivated()



    if not Tool.Enabled then

        return

    end



    Tool.Enabled = false

    local character = Tool.Parent;

    local humanoid = character.Humanoid

    if humanoid == nil then

        print("Humanoid not found")

        return 

    end



    local targetPos = humanoid.TargetPoint

    local lookAt = (targetPos - character.Head.Position).unit



    fire(lookAt)



    wait(0.15)



    Tool.Enabled = true

end





script.Parent.Activated:connect(onActivated)