When selecting reading material to learn English, first ask yourself what you enjoy reading in your native language. Find out what is available in your favorite genres in English. If the subject matter is interesting to you, you will be more likely to keep going.
Read a variety of different media in English, from magazines to novels to Internet forums. Remember English usage will vary depending on the intent and the audience. The New York Times is going to take a more formal approach to the English language than somebody's personal blog.