How do I find someone that can develop edible products for me?

Im very new to product development and all that. I want to start a brand where I sell, lets say PWO powder for gym people.

I dont know how to make it myself, how do I find a lab or something that can help me develop these types of products.

Same question applies for
– Cosmetics/Skin care
– Edible snacks etc, example CBD oil, Protein bars, Candy with vitamins
– Powder form stuff, like PWO, protein/whey powder etc

Its supposed to be a store ran only on ecom so thats why Im posting here hoping someone might have a clue.

Thanks!