If you have access to a good library, it's a good place to try various types of books to see what you like. Ultimately, what you will be reading a few years later is hard to predict from what you start reading now. However, in the beginning, finding something that "hooks" you is the best bet because it gives you the experience of being absorbed in a book. These are the books with which I have introduced some people to the world of books:

- The Lord of The Rings

- The Hobbit

- Dracula

- The Little Prince

- Animal Farm

- Asterix and Obelix comicbooks

- Siddhartha

For the next time, I'm going to try "Necronmicon" (H. P. Lovecraft!)

(EDIT: Formatting and added "Siddhartha")