Ok, first of all, I wish you the best of luck in your craziness. The time to swing for the fences is when you're young; that's when you can afford to take a couple of risks.

Your description does narrow down the kind of advice you should be looking for somewhat; it's true that most of PG's essays are directed at people who are trying to follow the "standard" route of venture-capital funding to an eventual IPO or buyout. Nonetheless, his advice on how entrepreneurs should act internally, as opposed to their relations with investors, still seems relevant. Try "Relentlessly Resourceful" and "Ramen Profitable" for starters. For myself, I find that I like his writing so much that I treat his essay page a bit like the Sequences: I go back and reread them every so often. So if your taste is like mine, you'll end up reading it all eventually; bwah-hah-hah! That said, the best stuff does tend to be in the middle - the post-YC essays are less interesting.

It seems you are going for financial independence rather than huge wealth; perhaps you are already aware of this resource, but if not, you will likely find the blog of Mr Money Mustache motivating.

And what the heck, while I'm suggesting readings anyway, go have a look at the archives of Joel on Software; as with PG, the best essays are from around 2003-2006, or so, but still very much worth reading. They don't ahve quite the same direct relevance to your project, but Joel seems to have done something similar to what you have in mind - build a company to sufficient-for-my-needs profitability without taking venture capital - so you might find it interesting to have a look at how he thinks. In particular, now I consider it, his Strategy Letter I seems relevant to your situation.

Edit to add: And, of course, beware of insight porn! You don't want to spend more than your lunch break or so reading these authors, excellent as they are. Get some dang work done! :)