If you create your module templates with h2xs:

h2xs -A -X -n MyModule
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and fill in the functionality and bundle it with

perl Makefile.PL
make
make test
make tardist
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you'll get a Module in the form CPAN provides it. And you can easily install it into your own directory (and should do it for development, because with more complex modules it is not so easy to wipe this module out if you want to remove it, whereas you just delete an own directory; the important command is the PREFIX-Option at perl Makefile.PL) with

tar xvfz modulename.tar.gz
cd modulename
perl Makefile.PL PREFIX=/path/to/own/modules
make
make test
make install
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In your perl-scripts, just load it by

use lib qw(/path/to/own/modules)
use MyModule;
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but you could as well use any other solution described on this page (e.g. $ENV{PERL5LIB},...)