If you are interested in teaching you will necessarily have a lot of reading to do. Keep up with your subject, of course, but don’t miss the foundations of educational thought found in the classic texts of great thinkers and practitioners including Plato's Republic, Aristotle's Politics and Ethics, Emerson’s Essays, John Stuart Mill’s Utilitarianism and On Liberty, Maria Montessori’s The Montessori Method, John Dewey’s Democracy and Education and the writings of Jean Piaget.
Here are some additional recommendations:
Five Minds for the Future by Howard Gardner Harvard Business School Press, 2006 Ways of thinking that you and your students need to develop to handle what lies ahead.
Horace’s Compromise by Ted Sizer Houghton Mifflin, 1984 Horace’s School by Ted Sizer
The New Science of Teaching and Learning by Tracey Tokuhama-Espinosa Teachers College Press, 2010
Understanding by Design by Grant Wiggins and Jay McTighe Merrill Education/ASCD College Textbooks, 2005
The Measure of Our Success by Marian Wright Edelman Harper Paperbacks, 1993
Better: A Surgeon’s Notes on Performance by Atul Gawande Metropolitan Books, 2007
The Courage to Teach, 10th edition by Parker Palmer Jossey-Bass, 2007
First Days of School: How to Be An Effective Teacher, 4th edition by Harry K. Wong and Rosemary T. Wong Harry K. Wong Publications, 2009
In the Middle: New Understandings About Writing, Reading, and Learning, 2nd edition by Nancie Atwell Boynton/Cook, 1998
How To Talk So Kids Can Learn by Adele Faber and Elaine Mazlish Harper Paperbacks, 1999
Getting to Yes: Negotiating Agreement Without Giving In, 2nd edition by Roger Fisher, William L. Ury, and Bruce Patton Houghton Mifflin Harcourt, 1992
Not the same