I see what you're trying to do. Personally, I wouldn't use the WA CMS for regular users to update their listings and what not. I've only used the one that comes with Site Sculptor, and it generates it's own database tables, login section, etc. You could base your own registration and login pages on the same table, but after that I wouldn't know what to do next - it would take a lot of customization. It's really intended for updating static content by a few different user groups with access to different sets of pages.
What you need tis to create User accounts and all the related pages that go with with including all the signup forms, login forms, account update forms, etc. Most of these can be done using the Security Assist and Data Assist Wizards.
Then you'll need insert and update pages for the users to be able to enter and modify listings. which would of course populate the public users' search-results and detail pages, also easily done with Data Assist. Then if you want, you can create a public profile page for each user - similar to the user's own account profile page, but with limited info and of course have to updating features. All these pages would be dynamic.
For rules, you don't need to set any rules for the regular viewing of the ads. But you will need access rules for all the user account pages and admin pages.
You can build whatever functionality you want into the admin pages - such as show the user lists, modify user account information, view and edit the classifieds, send email notices to the users, etc.
What is your experience level in building sites that include these types of features? If you've done registrations and logins before, then you understand how that works, and how to set up and use the database and you should be well on your way from there.