How do I make a Chat function?

So what I'm needing is, When someone says a word, something happens. Its hard to explain, here is my script at the moment.

Players.PlayerAdded:connect(function(Player)
	Player.Chatted:connect(function(Message)
		if Message == ("Lumos") then
			script.Parent.Handle.ParticlePart.Lumos.Enabled = true
		end
	end)
end)

I've tested with other things but I'm just not able to make this work.

(The script is in a Gear, the gear has a handle and in the is the mesh and particlepart, inside particlepart is a particle emitter. The gear is also in starter pack)

What you needed to do was to check if the player has equipped the tool and then initiate the chat function.

tool = script.Parent
particle = tool.Handle.ParticlePart.Lumos
player = game.Players.LocalPlayer
tool.Equipped:connect(function()
print('Enter')
player.Chatted:connect(function(msg)
	if string.lower(msg) == 'lumos' then
		print('Works')
		particle.Enabled = true
	end
end)

end)

This is how i use player chatted functions just tweak it a little and it'll work.

game.Players.PlayerAdded:connect(function(plr)
	plr.Chatted:connect(function(Msg)
local msg = Msg:lower()
 if string.sub(msg, 1, 13) == "Lumos" then
 wait(0.1)
print("hi")
---------//do what you want here\\--------------
---------//you might need to add another end depending on what you write\\--------------
		end
	end)
end)