Getting Into Acting Or Commercial Acting.

Hi, i`m 13 years old and I really would like to become and actress. Even if it a little something in a commercial. I have been in 3 school productions so far. I would like to become an actress at quite a young age so that when I am older I can tell different agencies that I have experience. I have tried looking at different acting agency websites but haven`t been useful and I have no idea where to start!! Acting in Australia has always been a dream for me. Please contact me soon. Breeshey