A preliminary note: DON'T use Photoshop for anything containing any sort of text. Use an application which is suited for page layout, such as InDesign, FrameMaker, or even Illustrator. The results will be better quality text, and smaller PDF files.
That said, there are issues (thank you, Adobe) making it a bit of a pain in the butt to import images into a PDF document using Reader. You might search the defunct AcrobatUsers Forums for several discussions about that issue. I might come up with something additional, but it may take a little bit of time.
For entering text, and eventually images, you would create a form. Text goes into text fields, where you can specify several parameters. Depending on your Acrobat version you do this with the Field tool or in the Form Edit mode. Images would go into Button fields, where you specify the icon.
Hope this can help.