How can I make rounds, have them end, switch teams, and then start again?

So I havn't even begun coding this because I don't know where to start. I'm not asking anyone to write it for me, but if you did, you would have my undying gratitude. Anyways, this is what I need to do. I need to make it so that there is lobby, that when players join, start there, and stay there if a round is in session. Then, if a player on a CERTAIN team touches a brick, the round ends. Then, everyone gets teleported to the lobby. Then, (Pause for a breath) I need the map to respawn. After that, I need the teams to switch, and then after that, the players get teleported to there respective spawns, and a new round starts. -For the round ending, I need it so that if all of the people on either team die, the round ends.