Need help with spawns

So I'm trying to make a minigame sort of thing like mob arena but I don't know how to have two different teams spawn in two different places only when they are in the arena or whatever.
For example /arena join
it puts them in a spawn area and they choose teams(this part is easy)
then it teleports them to their respective spawns this is the part where I don't know how to do it. Any help is greatly appreciated

 

Location teamaspawn;
Location teambspawn;

for (Player player : teama){
player.teleport(teamaspawn);
}
for (Player player : teamb){
player.teleport(teambspawn);
}

 

Okay and on death would it send them back automatically or would I have to make an on death spawn method

 

aPandaification
Its a PlayerRespawnEvent
http://jd.bukkit.org/apidocs/org/bukkit/event/player/PlayerRespawnEvent.html
Set their respawn point according to their team using setRespawnLocation(location).