ASP Script - Improvements (Add-Ons)

Pls. visit this link, [login to view URL] My goal is to improve scripts and add more features into the script. I need a Captcha script add into it before user can submit a listing. Also, I need to add four more fields into this form. You can recommend more features or ideas in this scripts. Pls. let me know in details what you can add, the time to complete the task and how much it costs. Thank you.