[thewsc]

> Any advices welcome!

It isn't realistic that you are going to develop a product from nothing in your spare time. If you don't know anything about hardware, chances are your idea isn't even any good. You didn't even ask a proper question, presumably because that would ruin the fantasy. Are you telling me you can't google how to make a prototype?

Yes, that sounds pessimistic. So I will give you the real advice. If you actually want to bootstrap a hardware project in you spare time, do something that is realistic. Do an add-on board for an arduino or a raspberry pi, or something with an esp8266 that you design yourself and sell in small quantity on e.g. tindie.

How long is that going to take you? Depending on your software experience, maybe a hundred active hours. How many hours would be realistic on average every week your spare time, maybe five? So around six months if you include holidays. Now you can imagine how long your original idea would take.