Make a CPAN-like module is actually extremely simple,
because the tools do most of it for you.

The program you use is "h2xs" - historically, this
was used to convert somthing.h files in C into 
the XS interface to the perl internals.  A major
mess that you don't want to know about, believe me.

But you can use h2xs to generate a template of
a perl module for you, without doing anything 
complicated.  Here's the command to make a module
which will have the name JimsSampleModule.

 h2xs -AX -n JimsSampleModule

That's it.  It creates a whole bunch of cool stuff
in a JimsSampleModule/ directory.

Then all you need do is edit the various files:
source code, test.pl, readme, and so on.

After making changes, you issue the following commands

 perl Makefile.PL

which looks at what you have, and creates Makefile,
used by the "make" utility.  (A mess, but it's all
been done for you.)

Then you can say things like

 make install              # which installs the module,

or

 make dist		   # which makes JimsSampleModule.tar.gz

So there you go...