display new WordPress page content

First of all, you need to select the new template as your page’s template while creating a new page. To do this, choose the new template under “Page Attributes” setting just like below screenshot:

Now, you should make sure you are outputting the content in your page. Create a simple loop, and use the_content() within:

while( have_posts() ) {
    the_post();
    the_content();
}

Now your content will be displayed in your new page template.

PS: Image credits goes to WP Beginners