There are lots of resources that you might check out to prepare you for the class, ranging from the simple to the academic. Here are a couple I'd recommend.
CPH has a book by Pr. Scot Kinnaman, Worshiping with Angels and Archangels: An Introduction to the Divine Service. The book is aimed at all ages but would be particularly useful for children and those new to the Lutheran way of worship in order to help them understand the Divine Service. Pr. Kinnaman's blog has two tremandous resources, as well: a primer on Lutheran Worship and a glossary of ecclesiastical terms. Check these out.
Another book from CPH that would make a great companion volume to Bible class is Pr. Timothy Maschke's Gathered Guests: A Guide to Worship in the Lutheran Church.
Other volumes you will find helpful include some of those that should be on the bookshelf of every Lutheran family: a hymnal, The Lutheran Study Bible, the Treasury of Daily Prayer, and the Book of Concord.
For a more academic look at the Divine Service these resources may prove helpful:
Luther's Works, volume 53
The journal Gottesdienst as well as Gottesdienst Online, the accompanying blog, are also great resources for learners of the Lutheran Divine Service.
So, there you have it. Come and learn!