That was going to be another suggestion I could have added to my earlier comment, though I though I'd already included enough to be confusing ;-)
The advantages of bullet-journaling ("BuJo") are that it is flexible and adapts your personal needs. This is unlike most fixed-form journals.
I'd STRONGLY caution new-adopters to put an emphasis on utility over aesthetics. If you search bullet journaling on the Web, or particularly at YouTube, you'll find many cases of people getting hugely artistically creative with their journals. If that's truly your jam, then ... well, OK, I guess. But as a productivity tool, the principle emphasis in my view should be on, well, productivity.
My journals are utilitarian and not especially artistic. I do put time and thought into their organisation, but I'm not creating art-pieces.
The heart of my journals are 1) the index pages, 2) the end-references (I'll put what would otherwise be spreads and frequently-referenced information there), and 3) the actual journal pages and internal spreads themselves.
My preferences are a simple ruled or dotted journal, which I fill with the sections noted above. I do go through and number each page as I begin a new journal. That's a bit of meditative practice and discipline which IMO pays off.
And, for someone who does struggle (and is struggling) with organisation, the most valuable property of a bullet journal is that it's there for you to resume using even after you've abandoned it for days, weeks, months, or even years. With a pre-printed dated journal, you'll lose vast sections of unfilled dates. With a pre-printed structured journal, you fight with the page layout when it fails to fit your needs.