Awesome dude! I'm glad you went for it, don't get discouraged if you didn't get it 100% right at first, keep trying.
A lot of people's problem when they start is that they see all this visual information, all these details, and complicated shapes, and they don't know where to begin. Whats important in the beginning is fitting together the big shapes- the head, the ribcage+pelvis, and the limbs. Once you get those right, everything else just falls in to place.
Heres a painter where I broke down the original drawing, and then put those same shapes on top of your drawing.
Focus on step 1 and step 2 for now, get those big simple shapes in the correct spots, then add details like the shoulder pads, eyes, nose, boots, etc. later, once your sure you have a solid foundation.
Maybe give it another go and start with the line of action, the sphere, the bean, and the cylanders.