virtuemart front-end product upload (secured)

Hi! I use Joomla 1.5.24 with Mynxx (rockettheme template with virtuemart) installed. And use VirtueMart 1.1.9 What I'd like is frontend product upload and managing rights (upload, delete products) for registered users on a separate platform (can be built in into joomla). What is important that users should not have any more rights regarding joomla. Important: Users should see and manage only their own products, advertisement! Security questions are important. There would be 4 categories of registered users (with different rights), plus visitors without rights (described in the attachement). I'd like to let 3 categories from the registered users to be able to see the contact data belonging to all products on the webpage, while normal users can see only the products not the contact information. An excel sheet is attached, where the details are described more deeply (and I hope properly), about the 4 categories and authorisation rights. Please do not write to me any price without studying the excel sheet. Your sincerely Kiss Csaba Balázs