Setting up a secondary blog page

I am using the F8 theme. Basically I have three blog excerpts shown on my home page. I want to set up another page to display older posts in the same format. As I didn’t write the code for the homepage, I’m having trouble deciphering it. I can get a loop to show up under my “blog” page but I can’t seem to get it into the same format (three columns and a thumbnail) Here’s the code from the index page

<?php get_header(); ?>

<?php if (have_posts()) : ?>

<?php $i = 0; ?>
<?php while (have_posts()) : the_post(); $i++; ?>
<div class="span-8 post-<?php the_ID(); ?><?php if ($i == 3) { ?> last<?php  } ?>">
<h6 class="archive-header"><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title() ?></a></h6>
<?php
	$values = get_post_custom_values("thumbnail");
	if (isset($values[0])) {
?>
<a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><img src="<?php $values = get_post_custom_values("thumbnail"); echo $values[0]; ?>" alt="" /></a>
<?php } ?>
<?php the_excerpt(); ?>
<p class="postmetadata"><?php the_time('M d, Y') ?> | <?php comments_popup_link('Have your say »', '1 Comment »', '% Comments »'); ?></p>
</div>
<?php if ($i == 3) { ?><div class="archive-stack clear"></div><?php $i = 0; } ?>
<?php endwhile; ?>

<div class="clear"></div>

<div class="navigation">
	<div><?php next_posts_link('&laquo; Older Entries') ?></div>
	<div><?php previous_posts_link('Newer Entries &raquo;') ?></div>
</div>

<?php else : ?>

<h2>Not Found</h2>
<p>Sorry, but you are looking for something that isn't here.</p>
<?php include (TEMPLATEPATH . "/searchform.php"); ?>

<?php endif; ?>
<?php include (TEMPLATEPATH . "/bottom.php"); ?>
<?php get_footer(); ?>

And the code I’m using in the blog page

<?php
/*
Template Name: Blog
 */

get_header(); ?>
		<?php $posts = get_posts( "numberposts=12" ); ?>
<?php if( $posts ) : ?>
     <?php foreach( $posts as $post ) : setup_postdata( $post ); ?>
       <div class="post">
          <p class="post-info-home"><h6><?php the_title(); ?></p></h6>
          <div class="post-title-home">
            <?php the_time('d M Y h:i a'); ?>
       </div>
       <div class="entry">
          <?php the_excerpt(); ?>
          <em><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link: <?php the_title(); ?>">READ ENTIRE POST</a></em>
       </div>
     </div>
   <?php endforeach; ?>
<?php endif; ?>
<?php include (TEMPLATEPATH . "/bottom.php"); ?>
<?php get_footer(); ?>

Any help would be much appreciated. Thanks.