Go LLC to start. If you grow to a level of needing something else, you can pretty easily convert. Also, LLC is good for your taxes as a pass through entity until its not. I would speak with a local accountant and business lawyer, you’ll need both either way so make your introductions now.

Have you considered Angels? Use SAFEs, propel you down the line until the investment market improves.

Go to network meetings, cocktail mixers, whatever events like that. Have a QR code on a card attached to your products (make this card difficult to remove), with “complete the survey for a $5 gift card” to (give multi popular options). When you hand these out make sure to inform them the deal (Take this product home and try it out…it is free to you. It sells for …$. But I would PERSONALLY appreciate you filling out the survey and there’s a little something extra there your efforts). Have that QR code link to the survey. They then try the product at home, the QR card is there, they link because they now have an expensive product for free and feel that the effort for 15 mins work another $5 is worth their time.
This isn’t the cheapest way to do this, but if you want thorough responses this has worked for me.