animation is not in ac3d currently. (although andy has told us it will be in the a future release).
there are alternative programs you can use to import your ac3d made models, and animate them.
http://www.insanesoftware.de/ - CharacterFX
http://www.swissquake.ch/chumbalum-soft/index.html - MilkShape3D
as for the face tutorial, check out
http://ac3d.org/forum/viewtopic.php?t=228
hope it helps.
--Philip