What would a modern programming book be if we didn’t help you outside of the text? You should check out this book’s web page (http://pragprog.com/book/carubym/rubymotion) for updates and a discussion board; you also will find all of the source code for the examples used in this book. If you’re reading this book electronically, you can click the little gray box above each code sample to download it immediately.
Additionally, RubyMotion has a very vibrant community that can provide guidance. The RubyMotion Developer Center has more in-depth articles on many aspects of RubyMotion that we may cover only briefly. There’s also the RubyMotion user group, a great place to ask specific questions and get involved.