lucasfilmer ---
kreator and ENSONIQ5 are right, I may have jumped the gun a bit. Modeling (a decent) Yoda would not be a trivial task, and most of those who start a project such as this will drop out primarily because of personal disappointment with the results.
Especially since you're new to Anim8or, as ENSONIQ5 suggests, it's best that you pursue any project in which you have a personal interest on your own, first, and solicit suggestions from other forum members for how to improve your work.
Creating convincing and "real-world" 3D images is not really difficult, but it requires that you understand and master the fundamental principals of mesh structure and flow. And organic models, such as Yoda, are particularly challenging in this regard. Finally, talent plays a huge part in what comes from the mind of any artist.
Again as ENSONIQ suggests, start off slow, and don't be disappointed if you stumble a lot along the way. After all, if you're not failing, you're not trying. And there's plenty of talented and skilled Anim8ors here to help push you in the right direction.