How do I start my job as a quality assurance manager?

I have been given this job as a quality assurance manager in a fish processing plant. The processors are reluctant to accept change. They are untrained in basic sanitation principles, personal hygiene hand washing pest control measures and so on. There is a plant manger with some measure of experience but untrained in quality assurance. I need advice real fast. where do I start to effect changes in this company?