I think the conversation in this thread will give you a great idea about that:
https://cgcookie.com/community/14434-which-training-material-will-you-recommend-next
For the initial introduction to Blender I just did this course:
https://cgcookie.com/courses/fundamentals-of-3d-mesh-modeling-in-blender
which has been proceeding much better subD modeling a cartoon character than last time I attempted that. I have already forgotten a few hints though that Jonathan mentioned in the course.