Auditioning for Musicals

Its been a long ambition of mine to perform in musicals, but only very recently one I have tried to act upon. However, I have no idea where to start. I have recently started singing lessons for the first time in my life, and have discovered that I cover the following musical range - lower C to upper G (over 3 octives Anyway, I want to give it a go - can anyone point me in the right direction? Any help much appreciated.
Im a young 32year old living in St Kilda.
Cheers