Book excerpt: For people who are thinking of starting a mail order business, or those involved in or planning to get into the direct marketing industry, this nuts-and-bolts guide explains the ``how'' and the ``why'' of the concepts and the techniques that make direct marketing work. Direct Marketing Success shows why list selection is crucial, and then shows how to do it, how direct mail can dramatically increase sales force efficiency, and how to create winning packages. Written the Direct Marketing Association's ``Man of the Year'' for 1985, and AdWeek's direct marketing columnist.