Anything by John Gresham. He uses proper English. His books are on a variety of everyday topics, they are not very long, and they are fairly current. When I taught ESL I encouraged my students to listen to the news on TV because there was very little slang or accents to confuse the student of English. Good luck.
(Also, try to find a native English speaker to proofread anything you write. It is very easy to confuse verb tenses. Stick to present and past tense whenever possible. Keep it simple.)