How to use it outside loop by passing post ID?

I need help with using these functions outside the loop by passing post ID to it. So, before it was like below:

$author_id = get_post_field( 'post_author', get_the_ID() );

					$meta = '<span class="vcard author"><span class="fn"><a href="'.esc_url( get_author_posts_url( get_the_author_meta( 'ID', $author_id ) ) ).'">'.get_avatar( get_the_author_meta('ID'), 24).' '.get_the_author_meta( 'display_name', $author_id ).'</a></span></span>';

Now, I am not sure how to pass ID to plugin function in order to get the same result.

Thanks in advance.