As a professional graphic designer let me stop y'all right there. Photoshop (or The Gimp) is a photo manipulation tool, not a typesetting/flyer making program.
Unless you're designing for the web, stick with using Photoshop (or The Gimp) to edit the raster images you're going to put into your flyer.
A program like Adobe InDesign or Illustrator would be much better suited to the task but they aren't cheap, let alone free (well not legally anyway

).
Much like The Gimp is a free alternative to Photoshop,
Inkscape is a free alternative to Illustrator and
Scribus is a free alternative to InDesign. Neither is an acceptable substitute for the Adobe products in a professional environment, but either will do pretty much anything you need when it comes to making flyers, brochures, etc.