EAGLE Tutorial
Paul at gaussmarkov.net has s few great write ups on how to make your way through Eagle. He hasn’t updated his site in a few years. But his site is a great resource you will want to take advantage of.
Illustrator to Eagle CAD
Eagle has been a great tool for the DIY community for several years. Todbot.com has been gracious enough to share a great tutorial on getting custom shaped PCBs in EAGLE by using Illustrator. I wonder if this is possible in Inskape or Skencil?