How do I make the maps randomize?

I don't have any script and I was just looking for some add ons but I couldn't find anything that would randomize it just kept sending me to map 1 every time. I have all my maps in serverstorage. So i was wondering if anyone had any script to help me because I am very confused. I looked up youtube videos and they didn't randomize the map and if you do give me a script can you tell me where to put it.