I'm new to nature journaling, but not new to nature. I am, in fact, a geezer who has spent much of his life outdoors. A friend told me that I should get 'Keeping a Nature Journal' by Leslie and Roth, which I did. Knowing nothing I also bought 'Nature Journal'.
'Keeping' it's a great book. It will inspire you to journal, if you don't already. There's also plenty for semi-experienced or experienced journalists. If you, like most of us, don't think you can draw, buy this book.
However, I'm reviewing 'Nature Journal'.
'Nature Journal' is a bunch of blank pages for journaling. There are tips, etc, but it is mainly a pallet for self expression - journaling. What is so great about this book is the quality of the paper. You can erase any pencil drawings and hardly know they existed - particularly useful for newbies. I would think that the paper quality would also be great for pen and ink drawings (not there yet).
I recommend the exercises in 'Keeping' but I use a standard Composition notebook for this. I try to draw daily from photographs (mine, but there are plenty available on the net.