Could someone please help me with the missing steps for adding a custom page named "library"?

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How to add a Single Page
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Step 1: Route
open file: /public/application/bootstrap/app.php
add the following code at the bottom of the file
Route::register('/library', '\Application\Controller\SinglePage\Library::view');

Step 2:
create new file: /public/application/controllers/single_page/library.php

Step 3:
Add the following code within php tag
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namespace Application\Controller\SinglePage;
use PageController;
use Concrete\Core\Page\Theme\Theme;

class Library extends PageController
{

public function view()
{
$this->set('pagetitle', 'Library');

$elemental = Theme::getByHandle('elemental');

$this->setTheme($elemental);
$this->render('/library/view');
}
}
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Step 4: create a new file: /public/application/single_pages/library/view.php

Step 5: add the following sample code within php tag

defined('C5_EXECUTE') or die("Access Denied.");
<h1><?=t('Library')?></h1>

Step 6: Optional: log-in to back-end add the page in sitemap at appropriate location

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I am having issue with theme; it is not applying the default header and footer.
How do I inherit the site template?

Next items I don't know are

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How to create a Block
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Step 1: create file for block controller: /public/application/blocks/header.php

Step 2: add the ?? some sample code in file?

Step 3: create file for block view: ??

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How to add a Block to a Single page
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Step 1: In single page view function add the ?? following code
// Part 1
add some using statement?? to the single page
add/update __construct inputs??

// Part 2
$page = Page::getByID($pid);
$block = BlockType::getByHandle('some_block');
// ...define additional block attributes...
$page->addBlock('Area Name', $block);

Step 2: Open file /public/application/single_pages/library/view.php
Add the following sample code to display the block?

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I spend great amount of time last week; and I just hope I can have a working single page and blocks working correctly hopefully today or by end of the week.

Any help is greatly appreciated.