How do I insert a object and make its position 25 studs over a random players head?

I'm making a script that will insert a falling meteor and I don't know how to place it over a random player in the workspace? would anyone mind telling me how to do that

heres my script (its for script builder)

l = game.Lighting
local s = Instance.new("Sky")
s.Parent = game.Lighting
s.SkyboxBk = "http://www.roblox.com/asset/?version=1&id=1012890"
s.SkyboxDn = "http://www.roblox.com/asset/?version=1&id=1012891"
s.SkyboxFt = "http://www.roblox.com/asset/?version=1&id=1012887"
s.SkyboxLf = "http://www.roblox.com/asset/?version=1&id=1012889"
s.SkyboxRt = "http://www.roblox.com/asset/?version=1&id=1012888"
s.SkyboxUp = "http://www.roblox.com/asset/?version=1&id=1014449"
wait(0.1)
l.FogColor = Color3.new(0, 0, 0)
l.FogEnd = 1000
repeat
wait(0.2)
game.Lighting.FogEnd = game.Lighting.FogEnd -10
until
game.Lighting.FogEnd == 100
wait(0.1)
m = Instance.new("Part")
m.Parent = game.Workspace
f = Instance.new("Fire")
f.Parent = m
t = Instance.new("SpecialMesh")
t.Parent = m
m.Position = -- part I need help with...
t.MeshId = "http://www.roblox.com/asset/?id=1290033"
t.TextureId = "http://www.roblox.com/asset/?id=3197743"
t.Scale = Vector3.new(3, 3, 3) 
~~~~~~~~~~~~~~~~

First off, you want to get all the players in the game, like this:

local PlayerTable = game.Players:GetPlayers()

Next, you want to select a random player from that table, like this:

local ChosenPlayer = PlayerTable[math.random(1,#PlayerTable)]

Then, you want to get that player's head, like this:

repeat wait() until ChosenPlayer.Character:FindFirstChild("Head")
local PlayerHead = ChosenPlayer.Character.Head

Finally, you want to position the object over the player's head, like this:

m.CFrame = CFrame.new(PlayerHead.Position + Vector3.new(0,25,0))

Hope this helped!