I've started this notebook four or five times before, always with the same mistake: I'd design the whole site first — categories, a tagline, a color scheme, an "about" page with a bio I wasn't sure was true yet — and by the time any of that was done, I had no energy left to write the first real entry.
So this time the rule is simple. Every entry gets a date and a page of its own. Nothing is scheduled. Nothing needs to be a series. If a thought is worth keeping, it gets written down and linked from the front page, in order, and that's the whole system.
Why dated entries, not categories
A category system asks you to decide, in advance, what kind of thing you're about to say. That's a strange demand to put on yourself before you've said it. A date asks nothing — it just marks where you were standing when you wrote it, which turns out to be the more honest organizing principle for a notebook like this.
The date is the only claim a note-taking system needs to make about the future: that there will be a next one.
If this keeps going the way I hope, the front page will eventually be long enough that it needs its own reckoning — an archive, maybe, or search. That's a problem for a version of this site with more than three entries in it. For now, plain and dated is enough.