How do I verify the minimum order quantity and quality when placing an OEM order for health functional foods?

I am planning to outsource the production of health functional foods to an OEM manufacturer. What are the checkpoints regarding the Minimum Order Quantity (MOQ), the feasibility of small-batch production, verification items for raw material traceability, GMP, and HACCP certifications, safety testing for microorganisms and heavy metals, prototype costs and delivery times, and labels, standard documents, and contracts?