1: Looks like your domain is not pointing to WordPress.com name servers yet. Please go to your domain registrar's site and log into the control panel. You will need to update the name servers as below:
NS1.WORDPRESS.COM
NS2.WORDPRESS.COM
NS3.WORDPRESS.COM
2. That's correct. To clear up any confusion, WordPress.com and WordPress.org are two different entities. Please check out the following links to learn the differences.
http://support.wordpress.com/com-vs-org/
http://get.wp.com/
3: I've just refunded the $13 back to you.
4: See point nr 1
Feel free to contact us if you have any other questions.