Magento – Magento 1.9 – Admin sales order index template phtml file

Dinesh , Magento do not save product publisher attribute and etc product attribute in sales_flat_order_item so you can not get publisher attribute value from order item

So need load Magento product Obeject (Mage::getModel('catalog/product')) by order item product($item->getProductId()) then you can this attribute value if product is exit in magento

$product=Mage::getModel('catalog/product')->load($item->getProductId());
  if($product->getId()){
  /* product is exiting in magento
  $publisher=$product->getPublisher();
  }else{
    /* product has been deleted from  magento  so you can not get product data */

  $publisher='None';
  }

To show a phtml at layout, you need to add a reference block name <refernece name="Parent_Block_name_At_Layout">

Also, your block is not closed, use / or </block>to close block.

Or you need to set your block name = root instead of templateBlock

Basically...

<?xml version="1.0"?>
<layout version="1.0">

    <adminhtml_adminhello_index>

        <block type="core/template"  name="root" template="adminhello/index.phtml"/>
    </adminhtml_adminhello_index>

</layout>

Or

<?xml version="1.0"?>
<layout version="1.0">
    <adminhtml_adminhello_index>
    <reference name="content">
        <block type="core/template"  name="templateBlock" template="adminhello/index.phtml"/>
    </reference>
    </adminhtml_adminhello_index>
</layout>

If your Magento version is 1.9.2.2 or less and have applied Magento patch supee-6788, you need to change your url process.

If you have adminhtml.xml for this extension, you need to give permission to access the page.

So, go to System > Permissions > Users. select your user and save.