Customization of WordPress Add new post section

Hello friends,

I want to customize the wordpress (Add new post section)
What i want to achive is that
1)-I want to add another wordpress editor under the default wordpress editor. is it possible if yes how?
2)- I also want to add few input fields under the wordpress default editor
is it possible?

I know there is function called
add_meta_box
i.e

function sociable_meta_box() {
add_meta_box('sociable','Sociable','sociable_meta','post','side');
add_meta_box('sociable','Sociable','sociable_meta','page','side');
}
add_action('admin_menu', 'sociable_meta_box');

But that will display in sidebar?
Any ideas how to display content in body part?