Bread for the World
425 Third Street SW
Washington, DC 20024
This Christian organization engages in research, education, and advocacy programs for effective governmental efforts to relieve hunger throughout the world. They note that 6,000,000 children in developing countries die each year from hunger related causes (plus other millions from water related diseases). Their website includes statistics about hunger in individual countries and suggestions for you to help.
They published a very useful 61 page document called Getting Ready to Come Back: Advocacy Guide for Mission Teams. Written in 2009, the cost is $5.00. See www.bread.org/advocacyguide
Several other excellent books, pamphlets (some of which are free) and material you can download for no cost are also on their website.