Variable MetaTags Title/Description/Keywords for Classifieds

# I need for each advert on a classifieds site variable Metatags for title, description, Keywords eg: [login to view URL] The tags should be: Title: Distressed property Ireland - Allsop Auctions Dublin Ireland - Azooz Uk ( = +- Title of the ad) Description: Allsop, the UK's most successful property auctioneer and Dublin property consultancy, Space, join forces to bring to the market Irish properties for ... ( = the first 180 Characters of the ad description) Keywords: Distressed, property, Ireland, Allsop, Auctions, Dublin, azooz uk ( words from the Title with a maximum of 10) # For the categories we need to do something similar for title, description and keywords to make them unique # Furthermore i need an option in admin where i can then easily create a sitemap with the new Tags for all the ads and categories on the site