Many of the different programs within the "Compassion Peace and Justice" ministry area do have resources and study guides. While we don't have a centralized resource list unfortunately, you could peruse the various CPJ programs and see what's listed on the "resources" tab of each page. http://gamc.pcusa.org/ministries/compassion-peace-justice/
In the meantime, I do know that many PCUSA policies on peace and justice issues come with attached study guides. For instance, the 2006 PCUSA policy on Disabilities (http://www.pcusa.org/resource/living-body-christ/), the 2008 PCUSA policy on Serious Mental Illness (http://www.pcusa.org/resource/comfort-my-people-policy-statement-serious-mental-/), and the 2010 PCUSA policy on HIV/AIDS (http://www.pcusa.org/resource/becoming-an-hiv-and-aids-competent-church/) all come with study questions.
Also, if you loook under the church store for curriculum, or visit The Thoughtful Christian, you might find other good issue-based resources for purchase.
Finally, the Child's Advocacy office, the Environmental Ministries office, in conjunction with one of our PCUSA mission co-workers, just produced a 4 session study on children's health and the environment, connected to a situation in Peru.
I think the format is simple and effective for educating the topic. Do you have more study guide for other topics, related to justice and peace?