how to render create page form & list of contents in page.tpl.php
It is recommended to render the forms either in preprocess function or in the custom module. Example of rendering the form in preprocess function:

function MYTHEME_preprocess_page(&amp;$variables) {
  // Assigning node_admin_content form to the variable.
  $node_admin_content = drupal_render(drupal_get_form('node_admin_content'));
  $variables['node_admin_content'] = $node_admin_content;

  // Assigning page_node_form form to the variable.
  $page_node_form = drupal_render(drupal_get_form('page_node_form'));
  $variables['page_node_form'] = $page_node_form;
}


Now to render this form in page.tpl.php:

&lt;h1 class="page-title"&gt;Admin Page&lt;/h1&gt;
&lt;div class="content-left"&gt;
  &lt;!--load list of all contents("/admin/content") --&gt;
  &lt;?php print $node_admin_content; ?&gt;
&lt;/div&gt;
&lt;div class="content-right"&gt;
  &lt;!-- add new content form here "/node/add/page") --&gt;
  &lt;?php print $page_node_form; ?&gt;
&lt;/div&gt;