In addition to the documentation under construction at this site, the existing publications and videos are of course still accessible (see right column).
Furthermore, references on the web are compiled for you at this site's references area. And don't forget to read the FAQs (English/German)!
To create update media, start the self explaining UpdateGenerator.exe application (see the video "Download for Windows 7"):
On the target computer, start UpdateInstaller.exe and select update installation options (see the video "Installation under Windows 7"):
Click "Start" and your system will be updated: