Is there only the summoners rift map?
And how to get runes :P
There are currently three maps, Summer and Winter Summoner's Rift (pretty similar) and Twisted Treeline.
Runes are purchased from the store using Riot Points or Influence Points.
© 2013 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.