How do i make my head look at the cursor?

Hello

Im working on a flashlight script here is how it works:

It welds a flashlight and an arm to the players head.

Here is the problem: I want the flashlight to follow the cursor I dont know how to do that.

So if any of you can help me that would be awesome.

Thanks

And if you need to see the script for some reason, here you go

wait()
local player = script.Parent.Parent
cam = game.Workspace.CurrentCamera

rig = game.ServerStorage.Rig:Clone()
rig.Parent = cam

function Weld(a, b)
    local weld = Instance.new("Weld")
    weld.Part0 = a
    weld.Part1 = b
    weld.C0 = CFrame.new()
    weld.C1 = CFrame.new(1.2, -0.5, -2.7)*CFrame.Angles(0, -1.55, 1.5)
    weld.Parent = a
    return weld
end

w = Weld(rig.Main, player.Character.Head)