How do you make a Map Changer Gui?

For example, You can choose the map you want go on and you vote with many people. I don't want this to seem like I am making whoever answers this work so can you just tell me how to do it. You don't have to include a script.

The best thing to do would to be taking two random maps from the list and putting them up. Then, when the player clicks a button, the vote on that map would increase. Once voting time is up, the map with the most votes spawns.