Classifieds service website

I need to create a Classifieds Website similar to [login to view URL], but for services. My site must be simple and easy to use. It must have: Categories Area; Search Engine; Subscribe/Login-logout; Forum for each announce (where the costumers can make questions to the service provider); Rating system (the service provider can be rated by the employer, and the employer can be rated too); User Admin area (where the users can administrate theirs announces); Backoffice Area (where I can administrate the website); Payment system. (PayPal or cash) User Area must have a schedule module for Ads, and it can be optional for them to use or not. Ads must be confirmed first. Service providers can put references of previous works. Costumers can view previous works done of the service provider. Some days after hiring the service provider, costumer will be asked if he liked the service or not (Rating). Search engine can select if they need the cheaper or the best rated, or other. I can sell feature Ads. I can block ou ban a user. User can filter ads. Flexible ads, as some of them can set a fixed price, and others need to contact the service provider to set the price. The site can be built in English, but I need a easy way to translate it to portuguese as I live in Brazil.