Proto-Germanic Morphology

Is there anyone on the list who knows about the morphology of
proto-Germanic? After searching on the web I found countless pages
describing Gimm's and Verner's Laws but nothing on the actual *forms* of the
language. For instance, what were the person endings in the prensent tense?
How many tenses were there? How many cases, and how did they inflect? If
anyone could help me with these questions I would be most grateful.

Dan Jones