I want to be an actress and a singer,but in how long will I get discovered?

I live in LA.I am about to take vocal cles and acting cles at Powerhouse actor's studio. I have been in various dances,modeling and like in 3 plays. I also was in a commercial for my art cl in Guatemala. When I was like 10, an agent saw me dancing to a song in wal-mart and sent me on an audition to LA for new talent search. Then I got a call back and went to another audition,that agent liked me alot but my parents said no. But now I am ready. Besides that, Powerhouse Actor's studio will help me get an agent and agencies if the teacher sees I have potential. I also play clarinet, am learning guitar,piano and maybe another instrument. I know it's hard and to be careful, and that I will have to work really hard.