Jessica Hopper's "Ask Fan Landers" column on the Dallas Observer blogs addresses a useful topic:
Here's What's Wrong With Your Band's Web Site
These days, having a Facebook or Bandcamp page is important but not enough, and if you're going to build a web site, you should do it right.
books on that subject. Designing Web Usability by Jakob Nielsen (TK5105.888 .N56 2000) is a classic work in that field. While some of the specific advice may be a bit dated, the underlying principles are still dead on.
The other angle Hopper deals with is how to use your band web site as part of your larger publicity strategy. The library can also help you on that front with books on public relations generally and music publicity more specifically.