Making specific magazine style pages for certain categories?

Hello all,
So I have created new php files for two different pages called ‘News’ and ‘Writings’. Each page is to show posts from specific categories. To pull these categories, I was going to use the code:
`<?php
$catquery = new WP_Query( ‘cat=4,16&posts_per_page=10’ );
while($catquery->have_posts()) : $catquery->the_post();
?>
<h3><a href=”<?php the_permalink() ?>” rel=”bookmark”><?php the_title(); ?></a></h3>
<?php the_content(); ?>
<?php endwhile; ?>`

I want to get the format in which the posts displays to be similar to the single post page, just rather than a single post it scrolls down showing 8 posts and an ‘older posts’ button. I’m so new to PHP though so I don’t know what to change or where to insert this code?