From Better Writing Habits, some thoughts on The 3 Notebooks Every Writer Should Keep.
A Morning Pages Journal
Created by writing and creativity coach, Julia Cameron, Morning Pages are three hand-written stream-of-consciousness pages you write first thing when you wake up in the morning, before you do anything else. Cameron specializes in creative unblocking and recovery, and Morning Pages are the primary tool she recommends….
A Writer’s Notebook
This is the notebook you use for your writing. You can do writing prompts in it. You can keep little bits of conversations you hear throughout the day. You can record all your story ideas in one place…
A Pocket Notebook
Since your Writer’s Notebook will likely be a larger notebook, like a Moleskine or spiral-bound journal, it may be difficult to carry it around with you all the time. But as a writer, you will want to keep a notebook on you at all times, because you never know when you’ll want to write something down.
Also, when you keep a notebook with you all the time, you’re showing the Universe that you’re open to ideas, and that in itself will attract more ideas to you.
Read more at Better Writing Habits.