Not chronological archives

Well… maybe it’s a stupid question…
I’m relatively new to WP, and I understand it’s chronologically oriented. I mean archives are ordered by post date. It’s a good approach for a news-style site. But what if I need to set up a “book” style site? I mean a site where articles are ordered arbitrarily. I need to create a sort of an “index” page, where posts are ordered the way I want. For example I want to write a new post, and put it in the middle of the index, in the right “chapter”.
Can someone point me in the right direction to understand how to achieve this?
Thank you!