I Need Help with Raycasting Light functions?

What i am trying to do is make it so when it impacts at the end of the ray it creates a PointLight and fire.

What i currently have in the script:

wait(1)
local Tool = script.Parent;
local pewsound
local bangsound
local cam
local ggui

enabled = true
automatichold = false
dmged = false
shotgun = false
equipped = false
overheated = false
isZoom = false

-----------------------------------------ONLY EDIT THESE VALUES!!!!!-----------------------------------------
-----!Instructions!-----
--Make sure you have a part in the gun named Barrel, it is where the raycast will shoot from.--
--Just place this script into any gun and edit the values below.--
--Editting anything else will risk breaking it.--
------------------------
Damage = math.random(15,25)
SPS = 4 -- Shots Per Second, gives a limit of how fast the gun shoots.
Recoil = 8 -- [1-10] [1 = Minigun, 10 = Sniper]
WallShoot = false -- Shoots through walls.
GH = false -- [True = RB can't hurt RB.] [False = RB can hurt RB.]
BulletColor = "Bright orange" -- Any Brickcolor will work.
Flash = false
--------------------------------------------------------------------------------------------------------

local zm = Instance.new("Part")
zm.Name = "ZoomZM"
zm.Anchored = true
zm.Transparency = 1
zm.Size = Vector3.new(1,1,1)
zm.CanCollide = false
GunType = 0


 function LaserShoot(mouse)
    hit = mouse.Hit.p
    local StartPos = script.Parent.Barrel.CFrame.p
    local rv = (StartPos-hit).magnitude/(Recoil * 20)
    local rcl = Vector3.new(math.random(-rv,rv),math.random(-rv,rv),math.random(-rv,rv))
    aim = hit + rcl
    local P = Instance.new("Part") 
    P.Name = "Bullet" 
    P.formFactor = 3
    P.BrickColor = BrickColor.new(BulletColor)
    P.Size = Vector3.new(1,1,1) 
    P.Anchored = true 
    P.CanCollide = false
    P.Transparency = 0.5
    P.Parent = script.Parent.Parent
    local m = Instance.new("CylinderMesh")
    m.Name = "Mesh"
    m.Parent = P
    local c = Instance.new("ObjectValue")
    c.Name = "creator"
    c.Value = game.Players:findFirstChild(script.Parent.Parent.Name)
    pewsound = Tool.Handle:FindFirstChild("Fire")
    if pewsound then 
    pewsound:Play()
    end --Brick created. Moving on to next part
    local SPos = script.Parent.Barrel.CFrame.p
    if WallShoot then
    local Part1, Part2, EndPos = RayCast(SPos, (aim-SPos).unit * 999, script.Parent.Parent)
    DmgPlr(Part1)
    DmgPlr(Part2)
    if Part1 and Part2 then
    local enddist = (EndPos-SPos).magnitude
    P.CFrame = CFrame.new(EndPos, SPos) * CFrame.new(0,0,-enddist/2) * CFrame.Angles(math.rad(90),0,0)
    m.Scale = Vector3.new(.04,enddist,.04)
    else
    P.CFrame = CFrame.new(EndPos, SPos) * CFrame.new(0,0,-MaxDist/2) * CFrame.Angles(math.rad(90),0,0)
    m.Scale = Vector3.new(.04,MaxDist,.04)
    end
    elseif not WallShoot then
    local Part, Pos = RayCast(SPos, (aim-SPos).unit * 999, script.Parent.Parent)
    DmgPlr(Part)
    if Part then
    local dist = (Pos-SPos).magnitude
    P.CFrame = CFrame.new(Pos, SPos) * CFrame.new(0,0,-dist/2) * CFrame.Angles(math.rad(90),0,0)
    m.Scale = Vector3.new(.1,dist,.1)
    else
    P.CFrame = CFrame.new(Pos, SPos) * CFrame.new(0,0,-MaxDist/2) * CFrame.Angles(math.rad(90),0,0)
    m.Scale = Vector3.new(.1,MaxDist,.1)
    end
    wait(0.2)
    end
    game.Debris:AddItem(P,.1)
end

Also if anyone knows how to add a way to change the ammo to a cool down with a heat bar that would also be appreciated.