Also,get your "new guy" involved with your local PCC (Postal Customer Council). It is usually "co-chaired" by a USPS Postal employee, and, one of your local mailers. They usually meet once a month, and, go over postal regulations and processes. I'm not sure what the annual dues are, but, I'm sure it's next to nothing. The problem with postal regulations is, that they are NOT static, and, will change frequently. It's also a "mailer's trade group" where local mailers may exchange ideas and processes.
-MailGuru