Please, please use POD. I initially stayed away from it, but the effort required to learn really is minimal. Even if it's only you using the module, there's something satisfying about being able to do perldoc My::Module

In your constructor, you've hardcoded the required arguments - you may wish to try something like this:

my $args = { @_ };
#Check for required values
foreach my $required qw(arg1 arg2 arg3) {
    if(!defined($args->{$required})) {
         carp("Required value $required missing\n");
         return undef;
    }
}
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