Help with creating an admin options page

There you go Andy, hopefully this is what you want:

// register CSS files ready
function register_custom_styles() {
    wp_register_style( 'style1', plugins_url( '/css/style1.css', (__FILE__) ) );
    wp_register_style( 'style2', plugins_url( '/css/style2.css', (__FILE__) ) );
    wp_register_style( 'style3', plugins_url( '/css/style3.css', (__FILE__) ) );
}
add_action( 'wp_enqueue_scripts', 'register_custom_styles' );

//create admin sub menu - admin>appearance>styles
add_action('admin_menu', 'my_custom_submenu');
function my_custom_submenu() {
    add_submenu_page( 'themes.php', 'Styles', 'Styles', 'manage_options', 'styles', 'my_custom_submenu_page' );
}

add_action( 'admin_init', 'elh_register_settings' );

function elh_register_settings() {
	register_setting( 'elh-settings-group', 'user_select_styles' );
}

//create admin page for admin>appearance>styles
function my_custom_submenu_page() {
?>
<div>
  <h2>Select Style</h2>
  <form method="post" enctype="multipart/form-data" action="options.php">
	<?php
	    settings_fields( 'elh-settings-group' );
	    do_settings_sections( 'elh-settings-group' );
	    $selected = (get_option('user_select_styles') != '') ? get_option('user_select_styles') : '';

	?>
     <!--this option to wp_enqueue_style('style1')-->
     <label>  <input type="radio" name="user_select_styles" value="style1" <?php if($selected == "style1") echo "checked"; ?> />  <!--<img src="//path-to-style1-img" /> -->  Style1  </label>  

	 <br /> 

     <!--this option to wp_enqueue_style('style2')-->
     <label>  <input type="radio" name="user_select_styles" value="style2" <?php if($selected == "style2") echo "checked"; ?> />  <!--<img src="//path-to-style2-img" /> --> Style2  </label>  

	 <br /> 

     <!--this option to wp_enqueue_style('style3')-->
     <label>  <input type="radio" name="user_select_styles" value="style3" <?php if($selected == "style3") echo "checked"; ?> />  <!--<img src="path-to-style3-img" /> --> Style3  </label>  

	 <br /> 

     <?php submit_button(); ?>

  </form>

  <h2><?php if($selected != '') printf("You have selected %s.", $selected); ?></h2>

</div>
<?php
}