This topic is extremely important to me, and I find that keeping a journal whenever I use a divination tool very very very helpful.
There is no correct way to keep a divination journal, it's what works for you, it can be an elaborate leather bond book or a 50 cent spiral from Wal-Mart. What you put in it is almost like what you put in your BOS, what ever helps you, a guide to go back to if you want to attempt something again or do it again.
Now my Divination Journal is almost like my regular journal, I only write in it when my head is so crammed that my head will explode if I don't write it all down. Now I even use this Journal for dreams/nightmares, maybe if I meditate and something comes up that happened in my dream I can go back and see what all makes sense, if anything at all.
Those on here know that I have ADHD, I'm not using it as an excuse, but it can be tough at times for me to keep myself on track or on one thing for a long period of time. I also have issues with sleeping cause my brain just never stops, even in my dreams it's like flipping through the TV channels really fast cause nothin' is really on. So I have like 5 different Journals floating about my apartment. For my divination journal, like I said, I use that a lot when my brain might go boom! How I use it for divination though is this.
I usually write down the date, time of day (Dawn, Day, Afternoon etc), if it's full moon/new moon or in between, if I cast a circle or not. I don't always cast a circle when working with my cards, but if I really need to center myself and focus, I do. What tool I used (cards, runes, fire gazing, etc). The next step, not everyone agrees on, but I like to write down what questions I asked, the result of that question, and if what I asked happens or not(That happens obviously later). I use that system when I was using the Oracle Spread or Runes. With Fire Gazing, I just write down what I see, and later on if anything comes about what I saw. When I do a full Tarot reading, I write down what spread I use, what deck, and then list what cards came up if they were upright or reversed. The outcome of the whole entire reading and then I go back and write down if anything comes about from doing the reading.
Like I said, this isn't the way you *have* to keep your journal, keep it in a way that makes sense to you. I find keeping a journal separate from my BOS just for Divination purposes very helpful. But then again I'm an organized freak and if something is out of place I flip out, and yes, I seriously do lol! With keeping the journal you can always go back to see what works best, what doesn't, if anything came about from your reading, or if it's totally out there in left field and may not happen for a year. It's a tool you can put in your arsenal when tackling Divination.
Hope this made sense, and comes in handy to those that are seeking something like this to keep track of their progress.