How to draw and make Manga

Now let's see the basic principle of drawing body figures proportion. There are many ways to do this, but here's one way that I think pretty easy to do. First, you have to understand that people, mangaka and comic artist alike, likes to measure body size with 'heads'. The U.S comic artist normally makes an adult super heroes characters with 8 heads figures, while asian and Japanese manga loves to make it in 7 heads figures. If the character is a child, it would sized about 5 to 6 heads, depends on his/ her age. Here's how it looks.

Here's an 8 heads (or rather 7,5 heads) figures. First thing you need to do is draw the head. Then, using the size of the head, draw the rest of the body. As you can see, the lines goes through the characters' chin, the second line cross the nipple. The third line cross the bellybutton, then the crotch, middle of the thighs, under your kneecaps, the next line crosses right above the ankle. Use a basic geometrical shapes to make it easy to draw the shape of the body. After it's done, wrap it up with muscle and skin, following the basic shape you drew (ribs, shoulder shapes, etc). There's a slight different when you drawing woman figures.
Use the same basic principle, just make some variations and adjustments. As you know, and can see here, two most significant differences between men and women figures (aside from the obvious muscle size, skin tone and, err.. breast type) is the size of the shoulder and hips. Men got wider shoulder and smaller hips, while women has the exact opposite. Wider hips and smaller shoulder.

Note that this is just a very basic way of drawing body figures and proportion. Experiment all you want and enjoy the drawing process.