There are three steps to create manga. The first step is to create a plot and some character sheets. Character sheets are usually composed of the pictures of the characters and their profiles.
plot character sheet
an actual character sheet
The second step is creation of storyboard like thing.
(In Japan, we call it “a name”. It is used as a technical word and the meaning of the word "name" is different from the original one. I think the usage is peculiar to Japanese manga industry. )
To create a "name" means to draw manga rather roughly on thin paper by pencil according to the plot and the character charts.
(There are several methods of converting a plot into a "name". If you want to know it in more detail, please check Detailed manga creation 3 "name".)
an actual name (The size is reduced.)
The last step is to draw pictures in earnest. First you draw pictures more neatly than the "name" by pencil on thick paper for comic-drawing, and ink
the rough drawing.
If needed, "screentones" are put.
*Screentones are adhesive-backed transparent films with patterns printed on them
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a sample of detailed sketching by pencil (The size is reduced.)
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a sample of finished manuscript (The size is reduced.)
Usually titles and letters are typed by editorial departments. Since this sample work is not published, I typed them by myself.
This concludes my brief explanation. If you are interested in manga creation and want to know more, you can go to "Detailed manga creation" sections. Though I cannot explain everything on this website, I tried to put more detailed information about it there.