add pagination to custom category posts

This is my code I use this code to display latest 6 posts from custom WordPress category.. Now I want to pagination this post if posts are More than 6

…

<?php
$my_query = new WP_Query(‘showposts=10&cat=2158’);
while ($my_query->have_posts()):
$my_query->the_post();
$do_not_duplicate = $post->ID;?>
“><?php the_title(); ?></br>
<?php endwhile; ?>