You can assign values directly using this syntax:

$hash{'somestring'}[0] = 13;
$hash{'somestring'}[1] = 24;
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To print the data out you can eihter use Data::Dumper or do it by hand (useful if you need to get the data for some particular use of yours):

foreach my $k(keys %hash) {
    print "Key: $k\n";
    for my $i(0..@{$hash{$k}}-1) {
        print " - ".$hash{$k}[$i]."\n";
    }
}
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Michele.