community site for vendors

I am working on a community site that would allow vendors and visitor both registered on the site to interact via email, chat, event board and a personal diary inside each vendor’s profile space. 1. I would like to create two sets of members - vendors and visitor. These users can sign up on the home page and while registering will indicate category of membership (vendor or visitor). I would like to create an interface for advanced search for visitors to search vendors by username,category, company name and location (this information would have been input by the vendors while registering free on the server) 2. I would like users to be able to search vendors database from the home page and when found should be able to click on it to go straight to the vendor's profile or even chat with him if online. No visitor should be able to see vendor’s profile without login in first. 3. I would like each vendor to have personal diary or calendar within their space or profile. This diary/calendar should be configurable to the vendor to display his/her movements, events or appointments right within his account to visitors 4. I do not want visitors to have any personal profile on the server. just login username and password they can use to log in to the portal to search or read vendor's information You can see a demo site I have created which I want to further customize on [login to view URL] or creating a fresh one on my server with drupal already installed. I need someone who can complement my effort s by working fast and patiently with me to create and make adjustments where necessary till the job is perfectly done.