Here we're providing two resources for additional study on this introductory lesson.  The first is an incredibly helpful overview of covenant theology written by beloved scholar J.I. Packer.  It was originally penned as an introduction for a reprinting of Herman Witsius' classic work, The Economy of the Covenants.  The second resource is a four-part series of articles on the covenants, written by J. Alec Motyer for evangel magazine in 1983.  I hope these prove helpful for you.