Why won't this work???

Here is my script. Obviously there are 18 other if statements.

while true do
 wait(5) 
 m = Instance.new("Message") 
 local players = game.Players:GetChildren()
 -- This was useless

 if NumPlayers > 1 then -- What you had it set up.. It would only work only if it generated a 1. 
  math.random(1,18)
if num==1 then-- Map 1
  m.Parent = game.Workspace 
  m.Text = "Choosing Map..."
  wait(3)
  m.Text = "Map is 'The Classic Map', made by Anth4598"
  wait(3)
  m.Text = "This was the first map ever made for Blitz"
  wait(3)
  m.Text = "The Blitz will keep going until only 1 person remains.(goes for 30 seconds in beta)"
  wait(3)
  m.Text = "The weapon chosen is a sword."
  m.Parent = nil
  game.Lighting.Map1:clone().Parent = game.Workspace  
  for i = 1, # players do
   players[i].Character:MoveTo(Vector3.new(-7, 9.8, -4))
   game.Lighting.LinkedSword:clone().Parent = players[i].Backpack 
  end
  wait(30) 
    players[i].Character:MoveTo(Vector3.new(-169, 5.6, 27))
  game.Workspace.Map1:Remove() 
  m.Parent = game.Workspace
  m.Text = "Blitz over!"
  wait(3)
  m.Text = "You have 1 minute until the start of the next Blitz."
  wait(3)
  m.Parent = nil
    m:remove()
end
else -- This below will make it so the script shouldn't break if there is less then 2 players.
m.Text = "Need more then 1 player to start!"
wait(5)
m:Destroy()

Thanks!