Start Learning Cinema 4D with the help of the fine folks from GreyscaleGorilla. GreyscaleGorilla did publish a free 20 hour training that will get you started with Cinema4D, remeber the lite version is also included in the newest After Effect CC release.
Introduction to Cinema 4D (click)
Greyscalegorilla is an active community and resource for training and tools for creative types. They want to make learning more accessible and effective by creating easy-to-follow tutorials and training that show you way more than just what buttons to push. Greyscalegorilla also work to develop tools to streamline your creative workflow and to help remove tedious and repetitive tasks so you can spend time making great work.