Ok, so I posted a question a couple of days ago about the receipt that can go with the package. I just now printed out my one page postage, my question is....is the reciept part where it says "Information for the Mailer" and "Information for the Receiver?" If so, which one do I send with the book AND would this be considered advertisment (I'm sending by media mail)?

yes the reciept is the information for the receiver area. Most people do not bother cutting it apart and send both the info for mailer and receiver.

It is in no way an advertisment, it is an invoice and is just fine to include it with media mail.

Ah, thank you. Now I can send the book. 

Welcome to PBS cozy!

I circle the 'to' address with a bright marker and enclose the whole thing.  If your postal clerk is unknowledgable and objects to an 'invoice', I call it an 'emergency address' . . . USPS always encourages those!

You might want to print this from the Domestic Mail Manual - it had to do with what can be enclosed in a media mail package

Incidental First-Class Mail matter may be enclosed in or attached to any Media Mail piece without payment of First-Class Mail postage. An incidental First-Class Mail attachment or enclosure must be matter that, if mailed separately, would require First-Class Mail postage, is closely associated with but secondary to the host piece, and is prepared so as not to interfere with postal processing. An incidental First-Class Mail attachment or enclosure may be a bill for the product or publication, a statement of account for past products or publications, or a personal message or greeting included with a product, publication, or parcel. Postage at the Package Services price for the host piece is based on the combined weight of the host piece and the incidental First-Class Mail attachment or enclosure.

Amazing how much stuff we have to print just because we have to tell the avarage postale worker how to do their jobs and all the rules and regulations for said job!