Esperanto strikes me as an inherently literary language. I find that I learn the most about it by reading. Of course, I am a student of literature, so forgive me if this clouds my judgment! In any case, since your local library probably lacks solid Esperanto reads, you might need to drop a few dolaroj in order to procure yourself a book. Once again, the Internet comes to our aid!
I’ve had the most luck with Amazon.com in my online shopping experiences. Since they purvey goods from all over the world, the website is a good repository for Esperanto books, especially since you can buy them used. I recommend searching for “Esperanto books” in the little search bar at the top. However, if you’re feeling less adventurous, two conscientious users have assembled lists of worthwhile books. One is by someone named akompano. While I haven’t heard of him or her, that person has heard of Halldor Laxness, so I’m a fan! The other list is compiled by the talented Tim Westover, author of the short story collection Marvirinstrato. The man knows his stuff.
Bonan sxancon, and happy reading!