Ask HN: Want to start a small hardware company. What are some good resources?

Whenever I develop a new software idea, it's fairly easy for me to manage the implementation of the idea myself (hosting, servers, etc.) There's not a lot required to get the idea (or at least a functional prototype) off the ground.

However, I now have an idea for a hardware product — something that is small, cheap, and electronic. The intended audience of the product would be brick & mortar stores. But I have no idea how to begin this task; as in, I don't even know which search terms to use.

Essentially, I need to know how to find:

* Who can manufacture my product? Each item should cost no more than $30 or so to produce. There's no new technology here — just a combination of existing technology. I know China manufactures a lot of electronic goods, but how do I reach one of their manufacturing companies? How do I handle the language barrier? And as someone completely new to this kind of endeavor, how can I make sure I won't get scammed? * What legal knowledge do I need to obtain? What information should I keep track of for taxes (in the U.S.)? For such a small "company" (if you can even call it that), should I try to handle the finances myself or hire someone who knows what they're doing? * Marketing. How should I go about marketing my product? It's not something the average person would be, so I think online advertising would be a wasted effort. Cold emails to the B&M stores? Visits in person? Phone calls?

Books, websites, online courses — anything related to hardware entrepreneurship would be very useful to me. Thanks!