That’s great, Katherine!
While that list is a great guide, you may find your needs change over time. A list like that is a great starting place.
As to what happened in your case, I’m not sure. I have a series I’m working on this year for a client. I planned it out last year and am creating the content week after week. I don’t know exactly what I’ll say until I write it — and that’s much of the fun of doing it.
If you’ve lost your list, just make another one. You can always revisit the first one later!