Want to learn how? I recommend a Open: The Philosophy and Practices that are Revolutionizing Education and Science, edited by Rajiv Jhangiani and Robert Biswas-Diener.
In the spirit of open resources, it is totally free.
In the spirit of open pedagogy and quick sharing of teaching ideas, I wrote a chapter for the book about how I've gone about sustaining a blog dedicated to teaching for the last four years. The basic message of my chapter: I blog about teaching, and you can, too! Here are all the chapters from the book: