[Setup] Where do I start?

[Brenda Bell]

I've inherited a Plone project and I'm having some trouble sorting 
things out.  I first headed for the documentation which proved to be 
somewhat overwhelming.  So my first question is whether I can start with 
the Plone documentation or whether I need to start with the Zope 
documentation.

I have a clear idea of what I need to accomplish and I actually have a 
Plone site up and running on Mac OS X 10.5.  Clicking on the Control 
Panel gives me the following version info:

Zope Version
(Zope 2.10.5-final, python 2.4.4, darwin)
Python Version
2.4.4 (#1, Dec 20 2007, 22:27:19) [GCC 4.0.1 (Apple Computer, Inc. build 
5370)]

So my second question is how does one determine which version of Plone I 
have? I didn't install anything -- all I did was check out a bunch of 
files from SVN, follow some instructions to run a setup.py, bootstrap.py 
and buildout, and it basically came up running.

I have a long list of "Products", but the indicated versions don't seem 
to tell me whether I'm running Plone 3.x or 2.5.

What I'm trying to accomplish is relatively simple:  I need to populate 
a Plone Site from files (text and images) stored in the file system and 
have users be able to modify those files, either by editing the text or 
uploading a new image.  I've successfully used ExternalFile, but all I 
see in my Plone Site is a bunch of empty folders.  And ExternalFile is 
only available from the management interface -- not from my Plone Site.

I'm more than willing to consume the documentation -- I just need to 
know where to start.

Thanks.