ICANN has published a set of documents released for public review, including an introduction to the basic tasks of a Generation Panel.
The first Generations Panels that were formed have raised a number of issues that demanded further clarification as well as suggested the need for explanation and amplification of some of the provisions of the Procedure. As such they offer orientation and guidance, rather than detailed and explicit instructions. The output of the work of a Generation Panel is a set of Label Generation Rules for a given script (or multiple LGR in case a panel works on more than one script). See
https://www.icann.org/public-comments/lgr-guidelines-2015-01-15-en