Using a page to hold categorised posts

Look at: http://codex.wordpress.org/Pages#A_Page_of_Posts
just change this line:

'category_name' => 'antiquarianism, championship', // Change these category SLUGS to suit your use.

to

'category_name' => 'just-for-you', // Change these category SLUGS to suit your use.

if “just-for-you” is the category slug.

This Page of Posts makes use of a custom Page template:
http://codex.wordpress.org/Pages#Creating_Your_Own_Page_Templates

and queries the loop:
http://codex.wordpress.org/Function_Reference/query_posts
http://codex.wordpress.org/Function_Reference/WP_Query

http://codex.wordpress.org/The_Loop

maybe <?php get_footer(); should be <?php get_footer(); ?>

Create a child theme for these changes if you are using twentyeleven.