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I think that you could use conditional tags for this
put this code in header.php below
<link rel="stylesheet" href="<?php bloginfo('stylesheet_url'); ?>" type="text/css" media="screen" />
CODE:

<?php if (is_category('sports') || in_category('sports')) { ?>
<link rel="stylesheet" href="<?php bloginfo('stylesheet_directory'); ?>/sports.css" type="text/css" media="screen" />
<?php } elseif (is_category('hunting') || in_category('hunting')) { ?>
<link rel="stylesheet" href="<?php bloginfo('stylesheet_directory'); ?>/hunting.css" type="text/css" media="screen" />
<?php } ?>

I added crisjb code too
look at the lines from 151 to 158
http://pastebin.com/fR9C0Avi

put this in index.php before the loop:

<?php
if (is_home()) {
query_posts('posts_per_page=5');
}
?>

This theme is from WooThemes, so I think you should go to WooThemes support forum.

Anyway you can try:

Settings->Reading Settings and change “Blog pages show at most”

You could use conditional tags :
is_page(‘2’) Where 2 is the page ID.
is_page(‘about’) Where about is the page slug

put this in sidebar.php:

<?php (is_page('2')) { ?>
sidebar content for specific page
<?php } else { ?>
default sidebar code
<?php } ?>

<?php if (is_front_page()) { ?>

<h1>TEXT</h1>

<?php } else { ?>

<h1><?php the_title(); ?></h1>

<?php } ?>

You could try something like this:

<ul>
<?php
$args=array(
  'orderby' => 'name',
  'order' => 'ASC'
  );
$categories=get_categories($args);
  foreach($categories as $category) {
    echo '<li><a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name. ' ('. $category->count . ')</a> </li> ';
}
?>
</ul>