why is my plugin not working? [SOLVED]

I'm making a bunch of new plugins. Here is one:

local toolbar = Plugin:CreateToolbar("Troy's Lighting Tools")
local button = Plugin:CreateButton(
"Enable Time Changer",
"Click to enable time changer; a feature that will change the TimeOfDay untill you close studio.",
"http://www.roblox.com/Sun-cutie-mark-item?id=152525784"
)
local mouse = GetMouse()
local hit = mouse.Hit
function onhit(hit)
m = Instance.new("Message", game:GetService("CoreGui"))
m.Text = "Untill you close studio, the time will always be changing."
wait(5)
m:Destroy()
game.Lighting.TimeOfDay = TimeOfDay+1 -- the timeofday is a string, but holds numbers.
end
mouse.hit:connect()

my problem is that I don't know how to get the user's mouse. (too bad plugins don't run localscripts.) I've seen it done like a thousand times. Can someone help me on this? Thanks for reading!

EDIT: The toolbar is not there even.OH MY GOD WHY DO I MAKE SO MANY MISTAKES??????!!!!!!!!!!!

EDIT 2: On line 4, it says that statement spans multiple lines. On line 8 it says (unknown global 'GetMouse'). finally on line 15 it says (Unknown global 'TimeOfDay').