What should I expect or have prepared when I go in person to sell my product (a cream) to physical stores?

I am new to the game of selling products and am trying to properly prepare myself so I don't come off as rude or as a dummy (as well as trying not to immediately traumatize myself). Technically it will be B2B sales. Most stores I want to sell at are small and independent, not big chains.

I have already registered the company, made the product, labeled it appropriatly, created the website, had a certified lab analysis done, gotten the product samples ready, and I have written down both the production cost as well as the sale price (on the website).

What should I roughly expect when I go to physical stores to sell my product to them? Do I simply walk in and ask for a manager? Am I missing something in my preparation (physical or mental)? Are products generally on consignment to stores or are they bought outright? Should I bring enough stock to the first meeting or is it normal to drop off products on a separate/later date?

All advice welcome! I am in the Mid/Southern USA. This is not an ad. I will not name my product/brand/website.