I am having trouble selecting players by team. Any help?

In a game I am working on, I want 2 players to be selected. These 2 players will be chosen from an automatically assigned "spectators" team and placed into opposite teams of "player1" and "player2". Basically a 1v1 match. To sum up, I need help making a script that can randomly choose 2 players from a spectators team, and create a 1v1 match. I also am trying to make sure that: ** a player can't be chosen twice** each player will be teleported to their team corresponding side

I hope I am not asking for too much assistance, but I am clueless. Thanks for reading and I hope you can help!

(This is something I've wrote so far. It's not close to done just showing where I'm going)

local player = game.Players.LocalPlayer
local users = game.Players:GetChildren()

local function choosePlayers()
	local users = game.Players:GetChildren()
	local selectUsers = math.random(1, #users)
end

while true do
	wait(3)
choosePlayers()
end

This script shouldn't be too much work at all to make, but for a complete beginner it may look complicated. The first thing that we should do is get out of that local script. You can not teleport players from a local script and defining a single player is completely useless. Now that we have that out of the way, we can begin making this happen. we'll start with making a way to tell if a player has been chosen:

game.Players.PlayerAdded:Connect(function(plr) -- run the code inside every time a player joins
	local Stats = Instance.new("Folder", plr) -- make a folder
		Stats.Name = "Stats" -- change the folder's name to "Stats" for later reference
		Stats.Parent = plr -- make the parent of the folder the player
	local HasPlayed = Instance.new("BoolValue", Stats)
		HasPlayed.Name = "HasPlayed"
		HasPlayed.Parent = Stats
end)

Now that we have a way to check if a player has been in already, we can start choosing them:

-- I would put this in a different script for organization, but you don't need to


local HasNotPlayed = {} -- This table will be used to choose which players can be selected.

while wait(3) do -- I'm assuming you wanted to do this once every 3 seconds for some reason?
local users = game.Players:GetPlayers()
	for i, user in pairs(users) do
		if not user.Stats.HasPlayed then
			table.insert(HasNotPlayed, user) -- puts every player  that hasn't played inside the table
		end
	end
	for i, user in pairs(users) do
		if user.TeamColor == --[[whatever the team colors for both of the fighters are.]] then
			user.TeamColor =  --[[whatever the spectator team color is]]
			-- the above code checks if the players were fighting, and if they were, puts 		them back to the spectator team.
		end
	end
	
	local Chosen = math.random(1, #users)
	local ChosenTwo = math.random(1, #users)
	for i, user in pairs(HasNotPlayed) do
		if i == Chosen then
			user.TeamColor = -- Team color of the first fighters team
			table.remove(HasNotPlayed, i) -- removes the chosen player from the table.
			-- Teleport the player to the first spawn 
		end
		if i == ChosenTwo then
			user.TeamColor = -- Team color of the second fighters team
			table.remove(HasNotPlayed, i)
			-- Teleport the player to the second spawn
		end
	end
	local HasPlayed = 0
	for i, user in pairs(users) do
		if user.Stats.HasPlayed then
			local HasPlayed = HasPlayed + 1
		end
	end
	if HasPlayed == #users then
		for i, user in pairs(users) do
			if not user.Stats.HasPlayed then
				table.insert(HasNotPlayed, user) 
			end
		end
	end
end

Tell me if I missed anything in the comments, or if an error occurs.

Hope I helped!

-Cmgtotalyawesome