We live in a time when many evangelicals are realizing that we are standing at the base of a really steep learning curve. These are demented times, and the steep learning curve consists of the effort you will need to exert just in order to keep your sanity. If you are in that position, and are not sure where to start, I would recommend starting with this book, The Justice Primer.
And if you click through, take a look at the other books there in the Mablog Shoppe. You can buy any of them in an e-form for one dollar, but there is a new option just recently added. All of the Mablog titles are now available in paperback, print-on-demand, from Amazon. At least for the present.
A Justice Primer
A basic introduction to the principles of biblical justice, desperately needed in our time.