Web developer

I want a website that members log into and sign up a few details about where they work and what their speciality is. Members would then be able to search for people by name or speciality and then email them from within the system (think a very simple version of friends reunited). I would also want a search directory so that members would be able to search for equipment companies (think a very very very simple version of yell). It would also need a message board a bit like classified ads, rather than long rambling blogs. There might be other bits to add to it later too (new pages), but that would be the start. I know what I want it to look like and how I would like it to behave, but I am an OT not a web developer so I have no skills to make it.