You’ll have to decide for yourself when to “formalize” your company by creating a legal structure like an LLC, buying liability insurance, and such. For advice on these matters, you can meet with volunteers at SCORE, and there are even places to get inexpensive legal help. Meanwhile, why not pull out a $100 bill and take a look at what you can do with it.
Once you have that problem or need nailed, the next step is to validate that idea and make sure you’ve actually got customers who will pay for it. This means building a minimum viable product, getting objective feedback from real customers, incorporating updates, testing the market for demand, and getting pricing feedback to ensure there’s enough of a margin between your costs and what consumers are willing to pay.
Now, making money online should seem like a pleasurable activity. Why wouldn't we do just about anything to see things through, since it would be a major source of pleasure, right? Wrong. In the beginning, like anything else, we might get really excited about it. We might also set our hopes very high. But that all comes crashing down when we begin to fail.