Courses:
If you have the money (not cheap) then Animation Mentor has good courses. Animation Mentor’s courses are taught by professionals within the animation industry.
Animation Mentor
http://animationmentor.com
Books:
The Animator's Survival Kit; $30; The definitive book on animation.
by Richard Williams
http://amazon.com/dp/086547897X
The Illusion of Life; $40; A history of Disney animation and the processes involved.
by Frank Thomas and Ollie Johnston
http://amazon.com/dp/0786860707
Input Device:
Wacom Pen Tablet; $80-$500
http://wacom.com/en-us/products/pen-tablets
2D Software:
Toon Boom Harmony; $75/month; used by Disney and many others.
http://toonboom.com/products/harmony
3D Software:
Maya; $125/month; used by Disney, DreamWorks, and Pixar.
Free student version of Maya; you're not allowed to use it commercially.
http://autodesk.com/education/free-software/maya
Blender; $0 or $10/month
http://blender.org
As a hobbyist, freelancer, or small to medium sized studio you can use Blender as a low-cost alternative to Maya ($125/month), ZBrush ($800), and After Effects ($20/month).
Blender Tutorials
http://blender.org/support/tutorials
Forums:
The 11 Second Club
http://11secondclub.com/forum
Blender Artists (community forum)
http://blenderartists.org/forum