How do i find a player's mouse a script instead of a local script?

I have this punching script and and for some reason it says "mouse(a nil value)" here is the script

local Humanoid = player.Character.Humanoid
	local debounce = false
	local mouse = player:GetMouse()
	mouse.KeyDown:connect(function(key)

		
		
		if key == "q" then
			if not debounce then
			debounce = true	
	------------------------------------------------------------------------	
		--Animation for Punch
		local Punch = Instance.new("Animation")
		Punch.AnimationId = "http://www.roblox.com/Asset?ID=644505212"
		local animTrack = Humanoid:LoadAnimation(Punch)	
	
			animTrack:Play(0,2,2.5)	
-------------------------------------------------------------------------------		
		--Lighting for Punch
		
		local lightning = replicatedstorage.RicoClass:WaitForChild("Lightning")
		local light = lightning:clone()
		
		light.Parent = game.Workspace
		light.Anchored = false
		light.CanCollide = false
		local w = Instance.new("Weld" ,light)
		w.Part0 = player.Character.RTIndexFinger
		w.Part1 = light
		w.C1 = CFrame.Angles(0,0,40)
		w.C0 = CFrame.new(0,0,0.2)
light.Touched:connect(function(part)
	if not db then
		db = true
	local h = part.Parent:findFirstChild("Humanoid")
	if h ~= nil then
		h.Health = h.Health - 10
		wait(0.3)
		db = false
		end
	end
end)
		
		wait(0.3)
		light:Destroy()
		
		
	
	
	
-------------------------------------------------------------------------------	
	
			
wait(0.3)
debounce = false
		
	end
		end
		end)

You cant. The server doesnt have a mouse. To acces mouse properties in the server you'll have to send each property over using remoteEvents fromout the client. (Or remoteFunctions)

Localscript:

Event:FireServer(mouse.Target,mouse.Hit)

Serverscript:

Event.OnServerEvent:Connect(function(player,target,hit)
--do stuff
end)