Trialstyle98 on "Template for Video-Playlist ( as custom post & Custom taxonomy)"

Hey Guys,
I would like to add videos from my Youtube channel to my blog.
Therefore, I made an custom Post Type "Videos" and a Taxonomy called "playlist" with the help of "Types".
Now I want to customize the site of the single taxonomies (taxonomy-playlist.php).
I would like to have the current Video displayed on the left side and on the right side (In the Sidebar) a list with all the content(Videos) in my playlist, like on https://gopro.com/channel/
First I tried it with an html list, but that does not really work.
Does anyone have better ideas how to realize this?

Here is my current code:

<?php get_header(); ?>

	<?php do_action( 'colormag_before_body_content' ); ?>

	<div id="primary">
		<div id="content" class="clearfix">

			<?php while ( have_posts() ) : the_post(); ?>

				<?php
					if (get_the_id() == $_GET['Videos']) {
						the_title();
						echo types_render_field( "video", array('raw' => false) );
					}
				?>

			<?php endwhile; ?>

		</div><!-- #content -->

	</div><!-- #primary -->

	<div id="secondary">
		<div id="sidebar" class="clearfix">
			<?php rewind_posts(); ?>

			<form action="<?php echo $_SERVER['PHP_SELF'] ?>">
				<select name="Videos" size="8" onchange="this.form.submit()">
					<?php if ( have_posts() ) : the_post(); ?>
						<option selected value="<?php get_the_id() ?>"> <?php the_post_thumbnail('playlist-video-thumbnail') ?> <?php the_title() ?></option>
					<?php endif; ?>

					<?php while ( have_posts() ) : the_post(); ?>
						<option value="<?php get_the_id() ?>"> <?php the_post_thumbnail('playlist-video-thumbnail') ?> <?php the_title() ?></option>
					<?php endwhile; ?>
				</select>
			</form>

		</div>
	</div>

	<?php do_action( 'colormag_after_body_content' ); ?>

<?php get_footer(); ?>

I know, this can´t work. But I hope that you understand what I want to do and can help me.