I need help with my admin commands, script doesn't work. Help please?

if Command:sub(1,7) == "bighead" then
	local Player2 = FindPlayer(Command:sub(9))
	if Player2 then
										local Number = FindPlayer(Command:sub(Player2:sub() .. 10))
									Player2.Character:FindFirstChild("Head").Size = Vector3.new(Number,Number,Number)
	end
end