VB Plugins - Good Coding practices

1- ... it is $results = $db->query_read("writethequeryhere,not seperate!");

2- no need of the "$content<>""" is the $content is not an array... !empty($content) or simply $content would do in the if-condition...

also, for a good way to code vBulletin, simply read vBulletin core files and comprehend the rules of their protocol.. it is clear.