Account Creation Scripts

I recently purchased a reseller's account using cPanel. I need to automate account creation, but the cPanel website didn't have enough information for me. Here is the basic script I am working with , not sure if this all I need to create an account. I have a few questions...

// Not familiar with this first line, #! means what? Is this basically telling PHP where the PHP cPanel module is located? I checked my account and couldn't find this in my directory, what do I need to install this module?
#!/usr/local/cpanel/3rdparty/bin/php
// Is this require file part of the module?
require '/usr/local/cpanel/Cpanel/Accounting.php.inc';

// Should I keep $host as localhost if the account is being created from a script within my account? If I sign up remotely, should I enter the full http address?
$host = "localhost";
// Is user my username I use to access my reseller's account?
$user = "";
//$accesshash and $usessl is unfamiliar to me, could you please explain this to me?
$accesshash = '';
$usessl= "";
// $acctdomain will be posted from the signup form. However, considering the client may not already have this domain, what will the address to the site be?
$acctdomain= "";
$acctuser= "";
$acctpass= "";
// Should $acctplan just be the string for my package, such as "released_Basic"?
$acctplan= "";

$accountSetup = createacct($host,$user,$accesshash,$usessl,$acctdomain,$acctuser,$acctpass,$acctplan);

My main concern is just having the correct module and scripts installed allowing me to create account scripts. My second biggest concern is the $accesshash and $usessl. I am not familiar with Secured Socket Layer, and I am assuming this is what I use for the Remote Access Key from my WHM.

Any help will be greatly appreciated.
Jesse