Firstly, StackOverflow is intended to be used to help you with your code, not write your code for you. Given that you've never posted here before I'll give you the benefit of the doubt. In the future, please give us code examples of what you have tried and explicitly explain what the problem is.
As far as integrating your posts with Flexslider, that should be easy enough. I've not used the plugin before, but I'll give it a go based on the documentation on the Flexslider site. There are good instructions on how to use the plugin here: http://www.woothemes.com/flexslider/
First, you'll need to make sure you have the necessary files linked inside of the<head></head>
tags of your header.php file.
Place these lines in the document head, you may have to adjust the paths to target the files.
<link rel="stylesheet" href="flexslider.css" type="text/css">
<script src="jquery.flexslider.js"></script>
Next you'll need to connect to the flexslider, place the code below in the head right after the two lines I just posted above
<script type="text/javascript" charset="utf-8">
$(window).load(function() {
$('.flexslider').flexslider({
touch: true, // to allow for touch controls
});
});
</script>
Then you'll need to integrate a loop with the slider markup. You need to place the below code in the template file for the page you wish to display the slider on.
<div class="flexslider">
<ul class="slides">
<?php
$post_query = new WP_Query('post_type' => 'post');
if($post_query->have_posts() ) : while($post_query->have_posts() ) : $post_query->the_post(); ?>
<li>
<?php the_title(); ?>
<?php the_content(); ?>
</li>
</ul>
</div>
<?php endwhile; ?>
<?php endif; ?>
Without actually installing the plugin and only by going off of the documentation I think this will work. Let me know if you have any questions. If this gets the job done, please accept my answer.