china importing

Hi,
Im an Australian who intends to importing products for health/bodybuilding in about 12 months time. If anyone has any reputable contacts or information/advice that would be useful to me that would be greatly appreciated. Does anyone know about international standards- are they being met by every exporting company in regards to products or is the onus on me to find out for each individual company? What is the best way to go about this to start importing?

Regards,
Qamar