I tried journalling "in order" a couple of times and got so fed up with it, you wouldn't believe. It was a bit better when I decided to journal on a randomly pulled card, defnitely. I love pen&paper, but I found that it's really hard, for me, to find the quiet time to write anything like that - there's always someone wanting something from me. So I keep mine on the computer, I'm much less likely to be interrupted sitting here. And it's faster, I can keep up with the speed of my thoughts. I use the TreeDB Notes program, and it really lets me be my inconsistent self. I have a separate section for different decks (different imagery - different meanings associated with it), each divided into the majors and minors, sections for interesting spreads, for readings, for daily draws should I wish to pull some, a small section on the suits in general and on the numbers. Oh, the entries in the decks section are also varied - there's the cut&paste of interesting observations others make around the forum and the internet generally, there are my own musings and notes from "entering the card" meditations, also interpretations of each card as a neutral, negative and positive.
So, as you see, you can do a lot of different things and not be bored. The best part is - just by writing, you're learning. You may look back into your notes later, if you're stuck for example, but I doubt you'll need to go over them to "learn", I know I don't. And I haven't managed to make notes on each and single card of at least one deck, but I'm managing pretty well, I think
Good luck to you with this project!