Hi nellypope, my reply was rushed this morning as I was supposed to be going to work. Having seen the good advice given so far, I would like to add:
When designing a web site it's always a good idea to have the Style Sheet on a separate file with a .css extension, that way you can keep the styling consistant between pages and make alterations to fonts, styling throughout the site by making one alteration to the style sheet.
You can do all this by hand coding in Notepad but Dreamweaver automates much of this and gives instant feedback on your changes
Despite it's claim that you need no knowledge of coding to use DW, I disagree. I swap between wisiwig and hand coding; when you are trying to work out why the page doesn't act as you expected the coding is the bottom line (that is what the browser is interpreting).
Finally, for now, it might be worth setting up a local server on your PC. I use WAMP (Windows Apache MySql PHP). This way you can test your pages locally but behaving as if they were live. It can be a bit of a challenge to configure but I find it really useful (it wont do PHP Mail() functions, or, at least, I can't configure it).
Good luck.
It would be nice if the techies and web designers could pool their knowledge somewhere on this site. I've put up a couple of questions in the past but it's pot luck as to weather the right people see it.