The Book of Concord

[libertpaulian]

Start off with The Small Catechism.  ALWAYS start off with Luther's Small Catechism.  It's the simplest, most succinct summation of Lutheran doctrine.  Then, I'd read the Augsburg Confession, and then after that, the Large Catechism.  Once you've read the Creeds, the Catechisms, and Augsburg, you can read the rest of the documents in whichever order you like.