This is hardly an exhaustive list, but here are a few resources that can help you out as you learn 3D art.
Of course, the first link is this book’s website: http://www.3dartessentials.com
Communities often have training and have access to experienced artists who can answer questions:
CG Society: http://www.cgsociety.org
3D Total: http://www.3dtotal.com
Several sites are devoted to training, though they often have good communities as well:
Gnomon Workshop: http://www.thegnomonworkshop.com
Digital Tutors: http://www.digitaltutors.com
Geekatplay Studio: http://www.geekatplay.com
These websites have better access to the developer’s documentation, ...