Intermission and Teleporting Players and Randomizing teams? [closed]

Greetings, reader. I am very VERY new to all of this coding/scripting and would require a lot of assistance. The first thing I acquire assistance of is Intermission. I would like to know how to make a intermission (Ex. Round starting in 15 secs etc.). After I am done with the Intermission I would need help with Teleporting the Players and Randomizing thy very teams. I would like it so the survivors will spawn on one area of the map and so the Killer/Psycho will spawn on the other side of the map. And finally we have the Team Randomization. I have no idea whatsoever on how to randomize the team... I want 1/10 of the players to be the killer and only THEM to be moved to the Killer's team. I want the rest of the players to get moved to the Survivors team. Also I would like to know how to teleport the players back into the lobby once they are murdered or have finished the game. Thank you for taking your time to read this long and quite annoying (Sorry) message.