Yes! (But pic not related just doodling and was about to post anyway).
SO... you need to pick a mannequin system. The one up top is fine, Loomis did one in "Figure Drawing for All its Worth". Proko has one (and several demonstration videos.
The goal is to get basically boxes for chest pelvis head, cylinders for limbs (joints optional, a lot of people do balls but I think cubes are better for knees).
If you CAN'T already, you'll need to get good at boxes and cylinders in perspective. Don't go crazy and learn all of Scott Robertson's how to draw, just make sure you can draw a box and a cylinder and orient it fairly well. You'll get better.
Use a good set of proportions (Loomis is fine). Body is 8 head boxes tall, crotch is right in the center (4 head-boxes down). Just google "loomis proportions" in image search you don't have to go digging.
Now, just start by doing several dozen by copying a pose in a photo. You can use Croquis Cafe and just pause them. Draw your mannequin to match the photo, get it as good as you can, feel free to copy and paste both into photoshop layers so you can put the mannequin on top and see how close you got etc.
Then, you want to start coming up with your own poses. Start simple.
Eventually, once you're good at the mannequin, whats on the left will be much, much, easier. Add line quality, more specific anatomy, lots and lots of practice, maybe some color, VOILA!