Omega sub-theme : page--front.tpl and node.tpl

Hi

i would swith my D6 custom theme into D7 as omega sub-theme.
So to do that i need to rewrite my page-front.tpl with 960 grid logical.Actually my header is wide and not limited to 960px..

<div id="page" class="container_12">
<div id="header" class="grid_12">
 
<!-- row 1 -->

 <?php if ($logo): ?>
        <div id="logo" class="site-logo grid_2 alpha omega"> <a href="<?php print $front_page; ?>" title="<?php print t('Home'); ?>" rel="home">
        <img src="<?php print $logo; ?>" alt="<?php print $site_name; ?>" role="presentation" /> </a></div>
 <?php endif; ?>
        <!-- /#logo -->

then i need to convert my node--type.tpl to the omega logical.
do you know about tuto or doc about that ? i only found code on github..

thanks