Adding option to Classifieds

We need more options to be added to our Classifieds section: [login to view URL] : 1. All postings should be approved/declined by the admin before going online. 2. Posters, after approved, should be able to edit/delete their posts. 3. Admin should be able to block posters by IP/email. 4. Poster should receive "thank you letter" upon posting, before he is approved. (We will provide the text) 5. Poster should receive another letter when his post is approved. (We will provide the text) 6. Poster should be able to subscribe for notifications for new posts under a certain topic. 7. All work has to be done offline. We will not provide you with ftp access to the server. 8. Preference would be given to those, who could finish this ASAP.