How can I fix my admin script?

I bet there's loads of errors there for you. I copied the first part from the ROBLOX wiki, and went on. But there's some issues with the commands. The issues: /m command doesn't work. Message doesn't show up. /h command doesn't work either. Hint doesn't show up either. Code:

--[[
    Hi everyone, welcome to Keanu73's Admin v0.0.3.
    This admin is beta, so you might expect bugs.
    New features from v0.0.1:
    Added commands (alot)
    Added a admin join (you know, don't you?)
    New features + fixes from v0.0.2:
    Fixed the whole script (it was broken, really)
    Figured out some stuff
    Fixed the admin join message.
    New features + fixes from v.0.0.3:
    Added aliases for like Keanu73 is kea
    FINALLY FIXED THE ADMIN JOIN (maybe or not?)
    Added new commands
    Fixed freeze command
    Added a new tp command (oooh :D)
    Well that's all for these news. Goodbai <3
--]]

-- Put your name and your friend's names here too :P
local isAdmin = {"Keanu73", "marioadam98", "marioadamDad98", "septicshock", "Player1"}
-- Leave the rest of the stuff. You might break the admin script.
local target
for _,player in pairs(game.Players:GetPlayers()) do
        if string.sub(player.Name,1,#name) == name then
                target = v
        end
end
function findPlayer(name)
    for _, player in ipairs(game.Players:GetPlayers()) do
        if player.Name:lower() == name:lower() then
            return player
        end
    end
end

function onPlayerEntered() -- If an admin joined...
    game.Players.PlayerAdded:connect(function(plr) for _,v in pairs(isAdmin) do if v == plr.Name then print('isadmin') end end end)
    local Message = Instance.new("Message",game.Workspace)
    Message.Text = "An admin of Keanu73's Admin has joined!" -- Alert everyone that an admin joined.
    wait(10)
    Message:Destroy()
end

function onChatted(message, player)
    if message:sub(1, 5) == "/kill" and isAdmin[player.Name] then
        victim = findPlayer(message:sub(7))
        if victim and victim.Character then
            victim.Character:BreakJoints()
        end
    end
-- Remove this block ONLY if you don't have a door. And remove the block below too. Remove nothing else except those two blocks I said.
-- NOTE: If you do have a door, rename it to "Door" without quotes, and it should work.
    if message:sub(1, 5) == "/open" and isAdmin[player.Name] then
        local Door = game.Workspace.Door
        Door.Size = Vector3.new(8.8, 5, 2)
        local Message = Instance.new("Message",game.Workspace)
        Message.Text = "Opening door. You can go in :D"
        wait(5)
        Message:Destroy()

    end

if message:sub(1, 6) == "/close" and isAdmin[player.Name] then
        local Door = game.Workspace.Door
        Door.Size = Vector3.new(8.8, 19, 2)
        local Message = Instance.new("Message",game.Workspace)
        Message.Text = "Closing door. You can't go in D:"
        wait(5)
        Message:Destroy()
    end

if message:sub(1, 6) == "/admin" and isAdmin[player.Name] then
        victim = findPlayer(message:sub(8)) -- We'll define the player we want to have admin..
        table.insert(isAdmin, victim) -- Add them to the admin table
        local Message = Instance.new("Message",victim.PlayerGui) -- Not sure this works. :/
        Message.Text = "You are an admin of Keanu73's admin!"
        wait(10)
        Message:Destroy()
    end

if message:sub(1, 5) == "/cmds" and isAdmin[player.Name] then
        local Message = Instance.new("Message",game.Workspace)
        Message.Text = "Commands: /cmds, /admin, /open, /close, /kill."
        wait(20)
        Message:Destroy()
    end

if message:sub(1, 7) == "/freeze" and isAdmin[player.Name] then
        victim = findPlayer(message:sub(9)) -- define the player we want to freeze
        if victim and victim.Character then
        victim.Character.Torso.Anchored = true
        victim.Character["Right Leg"].Anchored = true
        victim.Character["Left Leg"].Anchored = true
        victim.Character["Left Arm"].Anchored = true
        victim.Character["Right Arm"].Anchored = true
        victim.Character.Head.Anchored = true -- Freeze the WHOLE character by anchoring ALL of it's parts.
        end
    end

if message:sub(1, 9) == "/unfreeze" and isAdmin[player.Name] then
        victim = findPlayer(message:sub(11)) -- define the player we want to unfreeze
        if victim and victim.Character then
        victim.Character.Torso.Anchored = false
        victim.Character["Right Leg"].Anchored = false
        victim.Character["Left Leg"].Anchored = false
        victim.Character["Right Arm"].Anchored = false
        victim.Character["Left Arm"].Anchored = false
        victim.Character.Head.Anchored = false
        end
    end


if message:sub(1, 5) == "/mute" and isAdmin[player.Name] then
        victim = findPlayer(message:sub(7)) -- define the player we want to mute their chat.
        game.Workspace.MuteEvent.OnClientInvoke:connect(function() game:GetService("StarterGui"):SetCoreGuiEnabled(Enum.CoreGuiType.Chat, false) end) -- epik hack
        game.Workspace.MuteEvent:FireClient(victim) -- Fire the remotevent on the player which mutes it.
    end



if message:sub(1, 7) == "/unmute" and isAdmin[player.Name] then
        victim = findPlayer(message:sub(9)) -- Define the player.
        game.Workspace.MuteEvent.OnClientInvoke:connect(function() game:GetService("StarterGui"):SetCoreGuiEnabled(Enum.CoreGuiType.Chat, true) end) -- Epic hack, again.
        game.Workspace.MuteEvent:FireClient(victim) -- Fire the event on to enable the chat.
end

if message:sub(1, 2) == "/m" and isAdmin[player.Name] then
    local Message = Instance.new("Message",game.Workspace) -- Add a new message to the workspace
    Message.Text = string.sub(msg,4) -- Get the user's text of the message he wanted
    game:GetService("Debris"):AddItem(Message, 10) -- Remove it after 10 seconds.
end

if message:sub(1, 2) == "/h" and isAdmin[player.Name] then
    local Hint = Instance.new("Hint",game.Workspace) -- Same as /m command.
    Hint.Text = string.sub(msg,4)
    game:GetService("Debris"):AddItem(Hint, 10)
end

if message:sub(1, 5) == "/heal" and isAdmin[player.Name] then
    victim = findPlayer(message:sub(7)) -- Define the player we want to heal
    if victim and victim.Character then
        victim.Character.Humanoid.Health = 100 -- Heal the player.
    end
end

if message:sub(1, 7) == "/damage" and isAdmin[player.Name] then
    victim = findPlayer(message:sub(9)) -- Define the player.
    if victim and victim.Character then
        local damage = tonumber(string.match(message, '%d+$')) -- The number of the damage the player specified.
        if damage ~= nil then -- If the damage doesn't exist then...
            victim.Character.Humanoid:TakeDamage(damage) -- Damage the player the number the user specifed.
                end

if message:sub(1, 3) == "/tp" and isAdmin[player.Name] then
    victim = findPlayer(message:sub(5))
    player = game.Players.LocalPlayer
    player.Character.Humanoid:MoveTo(victim.Character.Torso.Position, victim.Character.Torso)
end


         end

     end

  end

game.Players.PlayerAdded:connect(function(player)
    player.Chatted:connect(function(message) onChatted(message, player) end)
end)