Hi Mick,
The Cognos training courses use the sample GO Sales and Retailers package, which is shipped with ReportNet as standard. It can easily be imported onto your server - just copy the deployment archive from Samples into ReportNet's Deployment folder (on disk), create the GOSL and GORT databases and restore them from the samples shipped, then import the deployment from within Cognos Connection.
Different countries have different rules on issuing course data, so your instructor may or may not be able to provide you with the course data - depends where you attended the course.
Best regards,
MF.