Template for multi-page flyer

Hi, I've had a request for a multi-page flyer. It will consistently have the realtors info, links to website and such, but he wants to be able to drop in different photos and text. I can lay all of this out in Indesign, and export as a PDF. The problem is I don't know what software he has, and what he will be adding the photos and text in.

Does anyone have any experience doing this and know what programs will work. I don't think Acrobat reader is equipped for this/

Thanks, Elaine