Writing vertically in horizontally lined notebook


I'm still learning Japanese but I want to start writing anyway, I got a normal
notebook with horizontal lines but I would like to write vertically so I just
rotated it, my question is with this setup, which side of the notebook should
I start writing from?




[進研ゼミ explains](http://blog.benesse.ne.jp/tutor14/99k1/note/) how Japanese
high school students typically use normal (i.e., having horizontal rules)
notebooks for vertical writing:

[![enter image description
here](https://i.stack.imgur.com/cH6a9.png)](https://i.stack.imgur.com/cH6a9.png)

(This is a notebook for 古文, or classical Japanese classes)

So you can just rotate your normal notebook 90 degrees _clockwise_. With this
orientation, the page order remains unchanged, and the front page of a
notebook will be the same. The first line comes at the right.

Elementary school children usually use a dedicated notebook for vertical
writing. They are bound the same way normal Japanese novels are bound. ジャポニカ
is a famous notebook brand for elementary school children, and if you look at
their website carefully, you can see [a different side of a notebook is bound
depending on the subject](http://www.showa-note.co.jp/japonica/first_grader/).

In case you're totally new to vertical writing, you can easily find resources
for that, including
[this](https://en.wikipedia.org/wiki/Horizontal_and_vertical_writing_in_East_Asian_scripts).

