You could probably get a better answer over at cgtalk or conceptart or such, but since no one answered Ill give you how I started.
If you're like me and have a hard time actually sitting and looking in a book I would recommend these dvds:
http://thestructureofmandvd.blogspot.com/
You can check out the lessons he has online before you decide.

All my opinions:
PROS:
_For me_ its was easier to grasp because you follow someone while he points and talk,
I think its one step closer to having a teacher showing you, from books it can be hard to understand what exacly he means by showing just a few pictures.
He starts very basic - first you learn the bonestructre, and later snap on the muscles.
Its good to have some of structure when learning, no steps are skipped.

CONS:
I personaly didnt like his drawing style, although I dont think it made the ratios or anatomy knowledge less valid(just a generalisation anyway, isnt it?)
He doesnt actually tell the muscle names - but has an aproach where you are suppose to make it you own invetion(which can be good, but its good to know names when drawing, or atleast for me.)
Its by no means a proffessional dvd, its basicly just him sitting with a webcam.

I would though suggest that you have books too for reference, where you can investigate more and like a second source of information.
While I have been sitting the last 3 months with these it doesnt mean I can actually draw it in 3d space, you probably will need to start working with figuredrawing, which I would recommend Vilppu for. But anatomy sure helps to render the forms on the figure, you know what to look for.

Im no expert, and I might have missed something, just droped by to give a suggestion where to start.