Start with documenting your flow and your raw materials. With your flow at receiving raw materials through shipping. Document each process from the start point (receiving) to the end point (shipping). Once you have a list of raw materials and a list of your process, now you and your team need to assess any likely and logical risks (Biological, Chemical and Physical). If any risks are identified, look to your Pre-Requisite programs (Pest control, supplier approval, etc.) and see if those programs help in minimizing the risk. If they don't you need to then look into determining steps for critical control points. I don't know much about your process, but most packaging, if it's plastic, there is not much of a biological risk within the process. Your main would be physical with maybe some chemical. Do some research on HACCP Plans, there are a lot of templates out there.