This is always a problem for me. Even when I’m at a figure drawing workshop, and it should be “obvious” - after all, there’s a naked person on stage… duh… - I still need a plan.
I found that my “plans” are not verbally stated (basically, in language), but are visually stated. Usually this means a thumbnail, in the case of a 2D image. But it could be a simplified 3D model. In any case, I obey the following “laws”:
Thou shalt not think too much.
Thou shalt work fast.
I find that 15 minute experiments help me learn software much faster then one really large project. So find some little toy, try to make something with it in 15 minutes, then move on. (And for fun, make hard copies of these experiments and burn them in a pile.)
Also, there are awesome examples in the daily sketch threads.