Help!

I need a way to have customers go in & put up a detailed ad..

Kinda like a classified ads manager but on a bigger scale..

I need it to be like this..

http://www.homestore.com/shop/welcomewagon/SearchResults.asp?City=Dallas&State=tx&imgCitySt.x=4&imgCitySt.y=13&poe=welcomewagon

where each customer can have thier full profile - etc.

Any help is MOST appreciated!!!

Thank you!