Hi there,
I'm not an accountant, lawyer or certified financial professional, but I've done various side hustles and built a business to the point of full self-employment. You're not missing anything.
Sounds to me like you're good to go on everything in your post. Sole prop is totally fine for starting out what you have in mind. It comes through your personal return via Schedule C and is simple enough for tax purposes. You want a sizeable income before getting into an S-corp.
Your second paragraph, I believe (and I could be wrong) you might be experiencing some "analysis paralysis" on moving forward with your side hustle idea. No need to get hung up on legal structure, tax implications, wondering if you have enough time for it, etc. Nothing wrong with putting those to the side, going for it now, and worrying about them later when the side hustle gets to that stage. I could be way off kilter in this impression of your post, so apologies if that's the case!
Good luck and get after it now! :)