I found the TEAR conference on A Heart for the Poor in May very challenging.
Here is a copy of the talk given by Charles Ringma. He nicely and simply gave the clear mandate from the Bible and from history for Christians to be actively involved in helping and caring for the poor in a constructive manner.
I also attended a workshop on "Vocation, Profession, and Mission," given by Dave Andrews. Some of the material is in his article Vocational Professionals. The opposite of an amateur is not a professional but a mercenary!