Start with the HTML tutorial on w3schools.com, then the XHTML tutorial there and then the CSS tutorial. Meanwhile, you’ll also want to learn using some image manipulation program (like Photoshop, but if you don’t feel like shelling out a whole lot of money then you can also take a look at the GIMP). You can then combine that knowledge to create a website (first design it in the image editor, then “slice” it, i.e. create the code that turns it into a website). Alternatively, you could skip the HTML and CSS part and move on right through to the designing in an image editor and have someone else slice it for you.