Help with featured post

Dear all,

Sorry for the question: how can I edit this php file in order that the slider shows my last 4 posts and the first lines of text as excerpt?
At the moment I have to insert manually everything (article and description). Thanks for the help

<?php$feature_name = ot_get_option('feature_name');?><section class="featured"><h5><?php echo $feature_name; ?></h5><div id="slider"><?phpif ( function_exists( 'ot_get_option' ) ){$slides = ot_get_option( 'feature_news_list' );foreach( $slides as $slide ){$slider_args = array( 'posts_per_page' => -1, 'post__in' => array($slide['feature_post']) );$bs_slider_query = new WP_Query( $slider_args );if ( $bs_slider_query->have_posts() )while ( $bs_slider_query->have_posts() ) :$bs_slider_query->the_post();?><div><?phpif(has_post_thumbnail()){the_post_thumbnail('slider_image');}else{echo '<img src="'.$slide['image'].'" alt="" />';}?><div class="caption"><div class="yellow"><h5><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h5></div> </div><div class="caption2"><div class="black"><span class="rating"><a href="#" class="active"></a><a href="#" class="active"></a><a href="#"></a><a href="#"></a><a href="#"></a></span><span>Posted in <?php the_category(', ') ?></span><p><?php echo $slide['desc']; ?></p></div></div></div><?phpendwhile;}}?></div><p class="pager"></p></section>

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