Dr. Chad Van Dixhoorn, a scholar of the Westminster Assembly which resulted in the Westminster Confession of Faith and the Shorter and Larger Catechisms that we use in our churches, has written a very insightful post over at Reformation 21 on "The Seven Marks of a Puritan Ministry"
It's worthwhile reading if you have a few minutes!
http://www.reformation21.org/articles/seven-marks-of-a-puritan-pulpit-ministry.php