wp insert post with my code on a blank new post - wordpress

Question

i am using this code to create a new page when my plugin is activated:
function create_policy() {
$my_post = array(
'post_title' => 'mobile page',
'post_content' => 'this is my content',
'comment_status' => 'closed',
'post_type' => 'page',
'post_status' => 'publish',
'post_author' => 1,
'post_category' => array( 3,4 )
);
wp_insert_post( $my_post );
}
register_activation_hook( __FILE__, 'create_policy' );
what i want to do is :
1) use my own code in the 'post_content', not regular text.
2) clear all the page and leave only the GET_header
i want a blank page with my code.
any advice ?
in addition to the comments:
this is the admin pannel code:
<?php
// create custom plugin settings menu
add_action('admin_menu', 'zeev_create_menu');
function zeev_create_menu() {
//create new top-level menu
add_menu_page('zeev movile redirect', 'zeev mobile', 'administrator', __FILE__, 'zeev_settings_page', 'favicon.ico');
//call register settings function
add_action( 'admin_init', 'register_mysettings' );
}
function register_mysettings() {
//register our settings
register_setting( 'zeev-settings-group', 'zeev_tracking_code' );
}
function zeev_settings_page() {
?>
<div class="wrap">
<form method="post" action="options.php">
<?php settings_fields('zeev-settings-group'); ?>
<table class="form-table">
<tr valign="top">
<td><textarea name="zeev_tracking_code" cols="90"><?php echo get_option('zeev_tracking_code'); ?></textarea></td>
</tr>
</table>
<p class="submit">
<input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />
</p>
</form>
</div>
<?php }
and this is the veriable what need to find himself on a blank page someware (and to work)
<?php echo get_option('zeev_tracking_code'); ?>

Answer 1

There are a few ways to get custom layouts in Wordpress on a page-by-page basis, but the most common is to create a new, custom template. In the theme folder, create a new file named what you like:
my-custom-template.php
The easiest way to start is to copy what you find in page.php into that directory. That will give you the structure with the headers and footers which are useful. Right at the top of the file, put:
<?php
/*
*
* Template Name: [My template]
*
*/
?>
Doing this will tell WP to automatically make this template an option when creating a new page. Now, when you create a page, you can select this template from the dropdown, and the page will use that. Inside the template itself, you can put whatever PHP or HTML code you need inbetween the get_header() and get_footer() you like, to style it, or just to show your two buttons.
If you want a totally blank page, you can remove the get_header() and get_footer() altogether.