Follow Hatice Bayramoglu through her process of modeling a head. This isn’t very in depth, but some times the best way to learn is just by watching someone else’s process.
Here’s the link:
We also suggest looking up speed modeling of characters on youtube or vimeo. It’s sometimes a much better way to learn than reading tutorials. Not too long ago, we posted the Making of Bruce Lee. This will really help you out as well if you pay attention to how its done.