First, report any safety issues to your supervisor, manager or employer. They have a duty of care to ensure the workplace is safe for all employees.
If the reported problems aren't fixed, you might need to contact your union rep, your employee OH&S rep, your union, or WorkCover NSW - - The NSW Government organisation responsible for enforcing Occupational Health and Safety law.
If you need to report work related health and safety incidents to WorkCover NSW:
http://www.workcover.nsw.gov.au/QuickLinks/IncidentNotification/Default.htm
For assistance and advice from WorkCover, call 13 10 50.
The WorkCover website includes a section especially for young workers:
http://www.workcover.nsw.gov.au/Workers/YoungWorker/default.htm
It includes a Guide for Young Workers in Hospitality: http://www.workcover.nsw.gov.au/Publications/Industry/Hospitality/YoungWorkersGuide.htm