Below are some resources that can help you learn more about policies that already exist, as well as how to go about working on policies that will make your community healthier.
Citizens Handbook: http://www.citizenshandbook.org/
Community Toolbox: http://ctb.ku.edu/en/toolkits#.UmbLsVPNlVY
Community Readiness Handbook: http://triethniccenter.colostate.edu/CRhandbookcopy.htm
The Guide to Community Preventive Services:
American Public Health Association: http://www.apha.org/programs/cba/CBA/resources/Public+Health+Policy.htm