Create a module in magento -

i have followed magento tutorials create module. in 3rd part "part 3 - magento controller dispatch". have no problem create module.but in part 4, confusing layout,

how create page template in magento written there.but, when followed code "create file at"

app/design/frontend/base/default/layout/local.xml 

i have local.xml file in theme. confused can create file , add lines

<layout version="0.1.0">     <default>         <block type="page/html" name="root" output="tohtml" template="magentotutorial/helloworld/simple_page.phtml" />     </default> </layout> 

i have local.xml file following lines written.

left.permanent.callout

<reference name="right">     <action method="unsetchild"><name>right.permanent.callout</name></action>     <remove name="paypal.partner.right.logo"/> </reference>  <reference name="root">     <remove name="global_messages" /> </reference> <reference name="content">     <block type="core/template" name="alert_global_messages" template="core/messages.phtml" before="-" /> </reference> <reference name="before_body_end">     <block type="core/template" name="jquery_noconflict" template="jquery/noconflict.phtml" before="-" /> </reference> 

now, how can add line

in local.xml file.