>But how do you tell if your storyboard will actually turn out good if/when animated, even if it's looking fine on paper?
The recipe is not the cooked meal. It all depends on the people animating or filming it.
>Also need some good resources for studying the skill.
Just check out a bunch of storyboad books. There are several out there. If you like Star Wars, there is one for the original trilogy. Or look and see if movies you like better have them.
sidenote: pretty sure that most of these new scans were lifted from the companion volume covering the original trilogy, or perhaps from the illustrated screenplay, the making of star wars, and/or the original art of star wars?
http://www.amazon.com/Star-Wars-Storyboards-Original-Trilogy/dp/1419707744/ref=pd_bxgy_14_img_y
also a load of his work in the book Star Wars Storyboards
it's awesome.