How do I make a endless Zombie wave script? [closed]

I Guess I can try something and you get me a final showing.

while true do 
Instance.new("Message", Workspace)
Game.Workspace.Message.Text = "Welcome to Blah blah blah"
Wait(3)
Game.Workspace.Text = "You shall be place in the arena... survive as much zombie wave as you can..."
Wait(3)
Game.Workspace.Message:remove()
****

Now here is where I needed Help.... I can skip the teleporting all players to a area part cause I can use the wiki but how do I script a function where It counts the number of players alive and it makes them go thru rounds of zombie.

Like If all players dies game over start back @ round 1 If all Certain amount of players survive the dead players gets to go back in. for each round the higher it gets I think I can try to script so that for each round that get higher the zombies get let say 15 more health.

and if a player dies they spawn in lobby and have to wait for the next turn.

this is a concept like those call of robloxia zombie games on rblx for examp der reise. I would love if someone help me with the scripting of it abit. I would gladly put you as credits and admin to the game once finish as of the map I can build it myself really good.