Digital Workshop

Just exploring the possibility of creating a wizard. I want to have fields where the user enters information. Some will be single line text. Other fields will contain large amounts of text (if the possibility exists to have that text formatable(sp?) that would be great). I also want people to be able to enter URLs, as well as be able to include files (.doc, .ppt, .pdf, etc).

I realize this is a tall order, but has anyone ever done something like this and /or can you think of any reason why it couldn't be done?