Classsified ads website

I need a classified ads website, SEO optimized. The coder shall not use an existing script, develop something new ## Deliverables I need a classified ads website, SEO optimized. The coder shall not use an existing script, develop me a new one Things I need: -Full CSS design: very clean, very simple. The css should be logically implemented, so I can edit it. -SPace to put Adsense-links -Google SEO optimized: titles of ads should be in head section, also keywords and description should be automatically transferred, No excessive use of scripts, I repeat, it should be clean? -Sellers should not choose a category for their ads, they just add a title, description, max 2 pixtures, keywords, a price and then submit. -buyers can contact sellers with a contact form. -the index page shows a list of new ads. -Sellers can login to the site so they can manage, delete and add ads quickly.? -Admin panel: here the admin get's a list of new ads. He then decides in which category he will add the ad. The program shows him a suggestion first (suggestion module). -The suggestion module works on keywords the admin can ad to a category. For example, if an add contains the word BMW, the program suggests the category Auto > BMW. The admin can overrule this. -admin has a clear overview of all ads -admin can delete ads and set an "inactivity term" (for example 6 month's) -when the inactivity term is reached, the ad continues to be on the site, but the contact details are deleted and instead you add links to similar active ads. -I want to collect e-mails adresses for a newsletter. I need to be able to export easily all emailadresses from people that approved to receive newsletters. -the admin shall be able to add and edit categories -translation module: as I presume you don't speak dutch, you have to design the site in English, but add a module that enables me to translate it in whatever language I like.