Are you perhaps trying to actually use a module called Module::Name? As far as I know, that kind of thing doesn't exist. You might have read an example somewhere that presumes that you replace "Module::Name" with some (or any) modules real name. The same goes if you see somewhere a mention about Foo::Bar or similar phony names.
Modules are typically taken into use in the code itself (with a "use" statement), not on the command line.
Perl on-line documentation:
http://www.perldoc.com/
CPAN on the Web:
http://www.cpan.org/
I agree with fibbi, Perl is awesome, düde.
Regards
Simon