How to make a random map and team generator?

Okay so what you have laid out is spawning players on a random map. Maybe make an intermission period. This will be really basic.

while true do
    wait(30)--intermission
    maps = game.ServerStorage.Maps:GetChildren()
    map = maps[math.random(1, #maps)]
    map:Clone().Parent = game.Workspace

    for _,player in pairs(game.Players:GetPlayers()) do
        if player.Character then
               spawns = map.Spawns:GetChildren()
         player.Character:MoveTo(spawns[math.random(1, #spawns)].Position)
       end
    end
    wait(300)
    for i,player in pairs(game.Players:GetPlayers()) do
        if player.Character then
            player.Character.Head:remove()
        end
    end
end

that is a basic game script but you mentioned teams correct?

while true do
    wait(30)--intermission
    maps = game.ServerStorage.Maps:GetChildren()
    map = maps[math.random(1, #maps)]
    map:Clone().Parent = game.Workspace
    blue = 0
    red = 0
    local teamplay = game.Players.GetChildren()
    for i = 1,game.Players.NumPlayers do
        local ran = math.random(1,game.Players.NumPlayers)
        if blue == red then -- if they are the same it is randomely generated
            br = math.random(1,2)
            if br == 1 then
                teamplay[ran].TeamColor = BrickColor.new("Bright blue")
            elseif br == 2 then
                teamplay[ran].TeamColor = BrickColor.new("Bright red")
            end
        elseif red >= blue then
            teamplay[ran].TeamColor = BrickColor.new("Bright red")
        elseif blue >= red then
            teamplay[ran].TeamColor = BrickColor.new("Bright blue")
        end
    end
    for _,player in pairs(game.Players:GetPlayers()) do
        if player.Character then
               spawns = map.Spawns:GetChildren()
         player.Character:MoveTo(spawns[math.random(1, #spawns)].Position)
       end
    end
    wait(300)-- five minutes
    for i,player in pairs(game.Players:GetPlayers()) do
        if player.Character then
            player.Character.Head:remove()
            player.TeamColor = BrickColor.new("White")
        end
    end
end

Just create 3 teams. One Bright blue, One Bright red, and another White. Spawns are still random but if you want to create seperate spawns, I'm sure you can do it (;