Lost in a sea of documentation...can you point me in the right direction?

[MooMaster]

I'm a complete beginner in Python, but I've been fooling around with
Java for a couple years, so I have decent programming experience...
Anyway, I was sitting around playing with Python, when I thought to
myself: "I know! I'd like to write a program that I can pass a path to
(say: My Pictures) and at a timer interval will pick a picture from it
and set my wallpaper to that" So I started reading about os, threads,
and the path for the special folders in the archives and in the Python
docs and I'm kind of lost because there aren't many concrete examples
in the documentation. Can anyone point me in the right direction as to
where I might find info that can help me write this?  

Thanks!