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path: appcodelocalBhtechDesigner
inside this folder all other folder Block, Controller

config.xml

<?xml version="1.0"?>

  <config>

     <modules>

        <Bhtech_Designer>

          <version>0.1.0</version>

        </Bhtech_Designer>

     </modules>

     <frontend>

       <routers>

          <routeurfrontend>

              <use>standard</use>

              <args>

                 <module>Bhtech_Designer</module>

                 <frontName>designer</frontName>

              </args>

           </routeurfrontend>

       </routers>

       <layout>

            <updates>

                <bhtech_designer>

                    <file>bhtech_designer.xml</file>

                </bhtech_designer>

            </updates>

        </layout>

    </frontend>

    <global>

        <blocks>

            <bhtech_designer>

                <class>Bhtech_Designer_Block</class>

            </bhtech_designer>

        </blocks>

    </global>

</config>

indexController.php

<?php

class Bhtech_Designer_IndexController extends Mage_Core_Controller_Front_Action

{

    protected function _initAction()

    {

        $this->loadLayout();

        $this->renderLayout();

        return $this;

    }

    public function indexAction()

    {

         $block = $this->getLayout()->createBlock('bhtech/designer');

         $block->setTemplate('designer/designer.phtml');

         echo $block->toHtml(); 

        //Zend_Debug::dump($this->getLayout()->getUpdate()->getHandles());



    }  

}

Block
designer.php

<?php

class Bhtech_Designer_Block_Designer extends Mage_Core_Block_Template

{

    // Methods (optional)

}

?>

designer.xml

<?xml version="1.0" ?>

<!-- Root node for Magento layout configuration -->

<layout version="0.1.0">

    <!--Page handle -->

    <designer_index_view>

        <!-- reference tag specifies the block where we a going to add child block -->

        <reference name="content">

            <!-- Our page content block -->

            <block type="bhtech/designer" name="designer" template="design.phtml"></block>

        </reference>

    </designer_index_view>

</layout>

path: appdesignfrontendbhtechdesigner
inside this folder layout and template folders are placed

layout.xml

<block type="bhtech/designer" template="bhtech/designer.phtml">

    <action method="setData">

        <key>area</key>

        <value>frontend</value>

    </action>

</block>

but I still getting error my magento version 1.9
please help me out if there any details document or example of this please give me that. I'm just trying to load a complete new template for a page.

In your config.xml your blocks name is not properly declared, you need to replace:

<global>

    <blocks>

        <bhtech_designer>

            <class>Bhtech_Designer_Block</class>

        </bhtech_designer>

    </blocks>

</global>

With:

<global>

    <blocks>

        <bhtech>

            <class>Bhtech_Designer_Block</class>

        </bhtech>

    </blocks>

</global>