That's pretty impressive coding style for your first Perl script.

Here are a few minor style points:

• Rather than rolling my own usage, I find Pod::Usage handy.
• A lot of people quickly out-grow Getopt::Std. Consider switching to Getopt::Long.
• Explicit return's from your subs are customary and can make your code more readable.
• It is common practice to declare and initialize your variables right before you use them. For example:

    # characters in password
    my @chars_pool = character_pool();

    # default password length
    my $pass_len = 14;

...

    # generate password
    my $password;
    for (1..$pass_len) {
        my $random_number = int rand @chars_pool;
        $password        .= $chars_pool[$random_number];
    }
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