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1-Shelf Life Testing
2-Licenses for Food Distribution
3-All laws and specs about this business(including material-processes-packing- handling)
I think the most important thing would be to know all the ISO standards and local/country standards that you would have to meet to start the business.
2nd think would be to know your target market, the demographics you are targeting.
What are your core products and what marketing strategy you are going to use. These would be some of the very basic things to know.