Based on what you wrote here, you do not need to learn any more things by reading -- you need to start DOING. *EVERYBODY* will be happy with "starting a self-sufficient small cash business" but that is easier said then done and you will never get there until you do it. BTW, you may lose money also, that is entrepreneurship/startups so you are overthinking it. If you are risk-averse (aka you have to "learn more" before doing something) ... then entrepreneurship/startups may not be for you -- and that is OK

You are on the right path with the steps you outlined above but there is NO holy grail or "the path" (I'm sure you've read enough and all the paths are different) so everybody has 24 hours per day to do something so you just need to do "enough right things". The lean startup model is good because you do not have to wait for "funding" (may never come) and you can just start doing something.

You may have to fail a couple of times to get it right -- again, that is OK -- this is how entrepreneurship/startups. So the first thing you really need to get right is "Do I want to do this?" Entrepreneurship/startups is NOT a job where you get PAID to do X (and whether it works or not, you still get paid). This is a lot of ups-and-downs but mostly fun journey if you are ok with taking risks.

Good luck!