I don't need 3. The first and only thing that you should do is a Proof of Concept (POC) / market validation.
Only if it shows positive results, should you move on to the next stages (MVP, funding, founder's etc - depending what you already have/don't have).
You can read how to do the validation in one of my previous answers here: https://clarity.fm/questions/6423/how-do-you-do-market-research
You can also have
I've successfully helped over 300 entrepreneurs, startups and businesses, and I would be happy to help you. After scheduling a call, please send me some background information so that I can prepare in advance - thus giving you maximum value for your money. Take a look at the great reviews I’ve received: https://clarity.fm/assafben-david