How can i add new post on new page

Posts don’t “add” to particular pages. “Pages” are static by default but in combination with Custom Page Templates you can make them do just about anything. You’d need to create a template for each of your pages and query for your posts by category, or tag, or a custom meta field… something like that.

It is difficult to tell exactly what you are doing and why, but it sounds like you may want to create a Custom Post Type for each of what you now have as a page, and then you can add posts to them specifically and directly. Paste some of the sample code from the Codex, like this:

function codex_custom_init() {
    $args = array( 'public' => true, 'label' => 'Books' );
    register_post_type( 'book', $args );
}
add_action( 'init', 'codex_custom_init' );

… into a file, save it to wp-content/mu-plugins/somefilename.php, and get a feel for it.