Hi!
In my oppinion the Volcan is the ideal place to start aerial freestyle because it gives you the basic feeling of sliding around on th nose of the board and sliding in reverse.
I have never really tried willy skippers but i guess they're a good place to start. I have heard people say that the Willy skipper is the ultimate board breaker though...
When i was learning the vulcan, this article really helped:
http://www.guycribb.com/userfiles/documents/vulcan.pdf
All the best!
Lampi