RemoteFunction to send information from local to server script not working?

I'm trying to send a players user from a local script in StartGui to a server script in workspace using a RemoteFunction but I get 2 error messages, either 'attempt to index nil with InvokeServer' or 'attempt to index nil with OnServerInvoke'. I've used the devs hub reference to make this but I just can't figure out why it's not working.

local script:

local Player = game:GetService("Players").LocalPlayer.Name
local Playeruse = game.Workspace:WaitForChild(Player)
if Playeruse:FindFirstChild(Player) == true then
    print(Playeruse)
end

local ReplicatedStorage = game:GetService("ReplicatedStorage")

local remoteEvent = ReplicatedStorage:WaitForChild("Remote")

local mouse = game.Players.LocalPlayer:GetMouse()
mouse.KeyDown:connect(function(key)
    key = key:lower()
        if key == "f" then
print("Keypressed")

        local Playersname = Remote:InvokeServer(Playeruse)
        print("ServerFired")
        print(Playeruse)

    end
end)

server script:

local ReplicatedStorage = game:GetService("ReplicatedStorage")

local remoteFunction = ReplicatedStorage:WaitForChild("Remote")


local function Playersname(Playeruse)
    print(player)

local player = game.Workspace:FindFirstChild(Playeruse) 
local Headlamp = player:FindFirstChild("Headlamp")
local LightEmitter = Headlamp:FindFirstChild("LightEmitter")
local Spotlight = LightEmitter:FindFirstChild("SpotLight")

    if Spotlight.Enabled == false then
        Spotlight.Enabled = true
    else
        if Spotlight.Enabled == true then
            Spotlight.Enabled = false
        end

end
end

Remote.OnServerInvoke = Playersname(Playeruse)

It does succeed in getting the players user, and registering the f key press, the only problem with both scripts is the RemoteFunction stuff, I would really appreciate it if someone could point out what I'm doing wrong. Thanks!