There are some things I would add to Will's list that came from advice I was given when I was working full time (I used to maintain a site with all my teaching notes at the University where I worked)

• Leave ample margins at either side of the page. The [landscape] screen orientation on a typical monitor is not ideal for reading.


• In general Sans Serif fonts are easier to read on screen than Serif fonts. The reverse is often true for printed matter.


• Try to avoid too many colours or fonts. In general not more than two fonts and not more than four colours - obviously images and the like are an exception.
  

Do learn html and how to use cascading style sheets (CSS). These, once mastered, make it much easier to maintain a clear, well laid out website as well as making for economy in use of resources.

Not a folk music site, but I maintain a web site for the local recorder society http://www.clevelandsrp.org.uk/ where I try to follow these principles.

Geoff