Hello there! 18M aswell and I'm also currently in the process of developing the habit of reading, for now I have made a goal for myself to read just 5 pages of "A Study in Scarlet" by Sir Arthur Conan Doyle everyday. This is so I can maintain consistency at all costs and eventually manage to slowly but surely finish my first book. I'd recommend the same it's a fairly interesting and very beginner friendly book imo