BIG dreams?

I am a great actress, if i can say so myself lol, but I am having trouble. I know need to go to acting school, are there any really good ones that the best actors and actresses have come from? I am involved in a play at the moment, I play the jester lol. Are there any really good agents or agencies? My rents are in denial but I will some day break free and show them all. Please I just need some names of good schools or agencies/agents. thanks anything helps