Re: General questions
1. Yes, these are all created by you in the
WP admin dashboard.
2. Yes, you can customise the ad form to contain whatever fields you like, including custom fields.
3. That would involve customization on your part, currently the search brings up listings as you see in the demo.
4. I'm not entirely sure what you mean by this, but you can create subcategories with the same name in different categories, and you can manually put ads in multiple categories manually in the back end (although this isn't possible for the customer to do).. Outside of that you would have extra customization to do.
5. Again, something you can customize with coding knowledge.