W3Schools is a great site to help you get up to speed with a wide range of web technologies, and offers several tips and tutorials.
W3Schools Online Web Tutorials
Good suggestion here.
First, I would start by actually learning HTML and CSS. It's one of those foundation things - yes, you can learn how to develop websites using a web editor, but it really helps if you know what's going on behind the scenes (especially in certain situations where your web editor isn't exactly cooperating the way you want it to). I mostly use a web editor now, but for certain things (such as widths of tables and some navigation editing) I will actually play with HTML code because my web editor wasn't quite working the way I wanted it to.
Anyway, when I took my web design class at ISU 5 years ago we were required to buy an earlier version of this book:
I highly recommend not only this book in particular, but this entire series. The book is laid out very well and step-by-step takes you through not only how HTML works, but why it does the things it does.
After that, I would recommend investing in Dreamweaver if you are serious about web design. It is extremely powerful and will do almost anything you want it to do. At the same time I would recommend getting this book:
Once again, very detailed, very laid out. It's basically the ultimate reference I have when I am not quite sure about how to work something.
If you are interested in one of the projects that I have done, check out
Cornerstone Baptist Church - Eldridge, IA. I did this site with a combination of Dreamweaver 4 (I'm going to be redoing it in the near future now that I have Dreamweaver CS3, which has a LOT more toys than 4 had), HTML, Photoshop, and Illustrator.