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There were two classes specifically about Subassembly Composer at Autodesk University 2011:
Co-author of "Mastering AutoCAD Civil 3D 2013"
AutoCAD Civil 3D 2013 Certified Professional and AutoCAD 2013 Certified Professional
AU2012 Speaker::: CI3001: Reverse Engineering with Subassembly Composer for AutoCAD Civil 3D
AU2011 Speaker::: CI4252: Create Subassemblies That Think Outside the Box With Subassembly Composer for AutoCAD® Civil 3D®
There were two classes at AU last year on this, one by myself and a very detailed class by Kati Mercier that you should check out. We both did an hour of how to get started with Subassembly Composer.
We also have a number of sample Subassemblies on the Help Wiki site that you could look at for starting points.