How can I make pages like this in Tumblr?

The tumblr design changes as often as you change undergarments (hopefully), and so some information I find doesn’t pertain to the current design anymore.

But I recently made a new blog aside from the one I’ve had forever, and I just noticed all the changes they made, so I’m a bit at a loss on how to do what I want to do.

I’ve never done this before either, but this new blog I have is dedicated to stories I write. I want to make it easier for my readers to navigate through different stories. What I want is like a “Table of Contents” page or something. I want a spot on the side or something where you can click on a title of a story and then it will bring you to another page where all the posts are from that story and in order.