I want to start a WWW site for images. I may want to sell images in the longer term, but at the moment I just want to get some of them online and start building visibility. I have some experience with building and runing a large text site (http://biotech.law.lsu.edu/) but not a clue about the nuances of a photo site. I use Dreamweaver for my text site.

Are there useful guides? Affordable or free software tools? I work digitally from 4x5 black and white negatives, but have no idea of the right image size and scaling for good WWW work.