buyers can list items on a mobile device to the new site

I want to set up something were my employs can list items on a mobile device send all the information to me allmost like a ebay item ,every thing needs to be catagory based with a auto responce ( choice ) for admin to buy or counter offer or just decline to sale to mutiple drop off stores. need to be able to pick items and information of 20 and more items to export to a CSV file. ( to work with 3rd party software ) [login to view URL] writen Job requirment will be needed so we both know the job and time frame ( this will need to be done by contracter )