need to add a post limit and pagenation to this query

need to add a post limit of 15 per page and pagination to this query… thx in advance

<?php

$querystr = "
	SELECT wposts.*, ABS(
REPLACE(SUBSTRING(wpostmeta.meta_value, 2)
, ',', '')) AS sortby
	FROM $wpdb->posts wposts, $wpdb->postmeta wpostmeta
	WHERE wposts.ID = wpostmeta.post_id
	AND wpostmeta.meta_key = 'price'
        AND wpostmeta.meta_value != '$TBA'
        AND wpostmeta.meta_value != 'REQUEST $'
        AND ABS(REPLACE(REPLACE(wpostmeta.meta_value, '$', ''), ',', '')) > '150'
        AND ABS(REPLACE(REPLACE(wpostmeta.meta_value, '$', ''), ',', '')) < '500'
		AND post_status='publish'
        ORDER BY sortby asc
		";
$pageposts = $wpdb->get_results($querystr, OBJECT); 

if ($pageposts) : foreach ($pageposts as $post): setup_postdata($post);
	$my_meta = get_post_meta(get_the_ID(), '_my_meta', TRUE);
?>
    <?php get_template_part( 'grid', get_post_format() ); ?>
    <?php endforeach; endif; ?>