Ooops, a bit late on answering this.
I have a done a few heads, and finished my first model only a month after I started using Maya, and it really didn't look half bad at all.
take a look at Kurts FREE tutorial on a basic human form
using a Nurbs Sphere, he inserts isoparms, and uses the new vertices to push and pull at the respective parts of the face to arrive at a "cartoony" like topology.
Seriously, watch the tutorial and follow it along. Its probably the best starting point i've ever used.
If you're looking into more organic modelling, then the whole tutorial is full of brilliant tips and tricks.