I googled bullet journal and found blog posts, etc. where people described how to get started and how they customized it for their own use. One of the NFPs where I volunteer gave out what looks like the perfect book to use at a training a few weeks ago. I’m sure any journal/spiral you have at home already will work but, in my googling, someone recommended this which is just like the one I’m using:
It’s pretty easy to just jump in. Now I’ll have to experience it to see how to custom it for me. Hopefully I’ll stick with it to give it a fair chance.