For the quickest of quickstarts, open the script at suites.thumbnailer.make and run it. Choose a folder containing image source files. These must be one of clip2gifs supported types. They should contain no periods other than the one in the suffix. The image files are built in a folder on the hard drive.
Most parameters are configurable and are kept in a settings table at user.netFrontier.settings.
See the reference for the parameters for settings that aren't obvious. Thumbnailer uses templates, these are different the Frontiers templates, they are templates that represent what will be the body text of a frontier template. I would be interested in hearing if someone develops some intersting 'look and feel' templates. I'll inlude several in the final distribution. If you are building the HTML in the OD, Thumbnailer will build glossary entries for each image, you will then also be able to leverage the full power the Frontier's other website building features.