Every site has page content. Obviously unique to that page.

My problem will be common to many site with a right column (as well as nav and content column).

The "content on the right" off my pages is not unique but needs to be editable.

Look at the right col on this site done in ADX CMS:
http://www.forcetechnologies.co.uk/services/manufacturing/assembly-testing-packaging

Each section actually has its own "right content". I can add the fields in a section holder but how do I then retrieve this data and include them in all the pages under this section.

Is there a guide to do this?

Thank you I think this may work:
http://silverstripe.org/page-content-widget/