Mod_Perl2 getting started

Hi,
I’m finding the online documentation regarding mod_perl2 confusing
with regards to all the various modules dealing with request structures etc:
APR::Request, Apache2::Request, Apache2::RequestRec, Apache2::Upload,
etc.
Does anyone know of a tutorial or example code that sorts these out?
Ideally a simple one module working code response handler that illustrates access to the 
parsed request, handles args as querystrings and Post data, uploads a file or
two, and returns an html page to the requestor. Anyone have something like that?
Thanks very much in advance,
Joe N