Altera recommends using Qsys, the next-generation system integration tool, for new designs. Qsys provides many advantages over SOPC Builder, including higher performance with the new Qsys interconnect and faster development with support for hierarchical designs. For more information, please visit the Qsys product page or Qsys support page.
This SOPC Builder support page contains links to literature documents, manuals, tutorials, user guides, and training classes as well as online demonstrations. You'll also find design examples and download links.