Basically to create a good site you need clean code and good graphics. So I recommend that you use a program like Dremweaver or Frontage or something like that when creating a website. And additional photoshop knowledge is a plus. Basically all you need to know is html so once you know that you should be creating website in no time.

You can lean javascript and css but it's not all that neccessary. So html should be pretty much what you might want to learn first. Then you can go into more advanced things like MySql and Php and so on.