I have used many schematic/PCB capture applications and I find that Cadsoft Eagle seems to be the standard for hobbyists.  As such, there are some peculiar features that takes some getting use to.  For instance, the user interface does not function like many point-n-click applications.  You can Google eagle tutorials and find plenty.

Below are some of my favorites:

• Dangerous Prototypes
  • Dangerous Prototypes Eagle Tutorials
  • Get Your PCB Made
• Sparkfun:
  • Schematic
  • PCB Layout
  • Custom Parts
  • Eagle Shortcuts
• Image on PCB using Eagle from Library