How to use Mega Sign to send a document to each recipient to fill out and sign?

You can customize the document for each user (name, title, etc.) and send in bulk for individual signatures using Mega Sign.  

This requires two files, a document template (Word, etc.) and a data source file (like csv format).  You link the template fields to the source file to populate unique values for each signer.  Mega Sign also picks up the signer's e-mail address from the source file.

Check out the tutorial:  https://helpx.adobe.com/sign/using/mega-sign.html