I'm a portuguese speaker learning english, and I'm also a teacher. I would like to know which literature books you like the most, for learning english.
You can basically read anything you want, it really just depends on your preference, what type of genre you like.
Maybe you can start off with a classic like "The old man and the sea" by Ernest Hemingway or a more modern book like "Thirteen reasons why" by Jay Asher.
I've actually found a great article that talks about great books for ESL learners, so feel free to check it out.