If you have access to Louis Berkhof's
Systematic Theology he is widely considered a reliable guide to the Reformed view, without much in the way of idiosyncrasy.
At
this link you can read John Brown's treatment of it which I think is excellent as a supplement and small corrective to Berkhof's discussion.
Also of great value is Calvin in the
Institutes Book 2 chapters 10 and 11.
Obviously on the theme of the covenants you could start reading now and not stop before the arrival of the eschaton and not have gotten through everything, but Berkhof and Brown will give you an excellent foundation on which to build. The nice thing about Brown is that it comes in small bites as it's question and answer format.