Let's seperate things:
1. Web browser: your target platform. Websites render html and usually javascript on a person's computer. They retrieve the web pages from a webserver. Most browsers also support plugins, which allow the rendering of other types of files that aren't html.
2. Photoshop - Primarily an image processing program. A tool that most pros use for creating or editting embedded graphic elements. Otherwise, irrelevant to the question of website development.
3. Flash - A program that allows you to create multimedia "Flash movies". There is an accompanying flash client plugin that can be installed in a lot of browsers to render flash movies. However, flash is a thing unto itself, is not html, nor related to it in any way,
4. Dreamweaver - A "what you see is what you get" webpage design tool that "renders" html.
So the first thing I should say is that the pros don't use Dreamweaver typically -- they hand code html and css. This is because most websites are actually programs, not static html. Dreamweaver has added a lot of features that let people who for example, use PHP to develope a website, can still use Dreamweaver.
5. What are your goals? This is the most important question to answer for yourself. What should this website do, and what features will it need? The answer to those questions will guide you. Off the top of my head, it sounds like you might be best served by looking at a hosting system, like the ones that Apple provides with .mac. For example, this is a website for an artist I know. It was created with a combination of a serverside blogging system called Serendipity, and the .mac gallery. Since she uses a mac, .mac makes it easy for her to move images to her gallery.
The site didn't have to be as minimalist as it is... that was her desire. The important thing to realize is that the first step is deciding on what pages the site will include.
http://www.janekurson.com/