This wont work, also how to do this?

I was making so when you join you get your own dragon. First I made so it will shoot fire, I have the main script and the fire script. BTW this script is from the tutorial from stickmasterluke. Also, I wanted to know if anyone knows how to make so when you join the game, everyone gets their own dragon that only they can ride? The fire wont hurt you when it hits you. I don't know why. Heres the main script first:

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--Made by BreBreGaming
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local sp=script.Parent
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local head=sp:WaitForChild("Head")
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local fireballscript=sp:WaitForChild("FireballScript")
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function breathefire()
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    local fireball=Instance.new("Part")
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    fireball.Transparency=1
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    fireball.Name="FireEffect"
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    fireball.BrickColor=BrickColor.new("Bright orange")
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    fireball.Shape="Ball"
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    fireball.Size=Vector3.new(1,1,1)
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    fireball.CanCollide=false
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    fireball.CFrame=head.CFrame
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    fireball.Velocity=head.CFrame.lookVector*50
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    fireball.TopSurface=("Smooth")
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    fireball.BottomSurface=("Smooth")
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    local fire=Instance.new("Fire")
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    local firescript=fireballscript:clone()
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    firescript.Parent=fireball
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    firescript.Disabled=false
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    fireball.Parent=game.Workspace
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end
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while true do
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    wait(3)
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    breathefire()
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end

And heres the fire ball script (the second script):

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--Made by BreBreGaming
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local sp=script.Parent
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local debounce=true
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function burn(hit)
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    if hit and hit.Parent and hit.Parent.Name~="Toothless" and hit.Name~="Handle" and hit.Name~="FireEffect" then
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        debounce=false
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        local humanoid=hit.Parent:FindFirstChild("Humanoid")
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        if humanoid then
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            humanoid:TakeDamage(99)
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        end
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        local fire=sp:FindFirstChild("Fire")
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        if fire then
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            fire.Enable
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        end
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        sp=Anchored=true
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        wait(3)
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        sp:destroy()
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    end
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end
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sp.Touched:connect(burn)

Well, for one, you've got a bunch of listed numbers in the scripts, and two, that script was by StickMasterLuke. :l