If your interested in learning web design I'd do the following:
Start in notepad!
Dont start off using tools like Dreamweaver or Frontpage. Though they are definatly handy down the road, its best to learn how to code on your own, so you understand how it all works. That way there wont be any problem you cant fix with your site.
Make projects for yourself
The best way to learn is by doing, just make projects for yourself to keep you busy, you'll learn more with each one. Oh, and sometimes its not a bad idea to 'bite off more then you can chew'. Go try something you think is out of your league, it'll help you fill in the gaps... and most of the time you'll realize most things in web design arent that hard to do.
Find good resources
Find some good resources to check when you are stuck. There are a lot of good web designs forums out there too, with a lot of people willing to help.
Places to check out
HTML:
http://www.webmonkey.com/webmonkey/reference/html_cheatsheet/
CSS:
http://www.w3schools.com/css/css_reference.asp
PHP: (down the road...)
http://www.php.net
Hope that helps