Go ahead, pick a font to read this story in. You may notice this makes it harder (or possibly easier!) to read, depending on the font choice. Read on to see why. You make font choices every day.
Write out your blog or article and read it ... When in doubt, go with a pre-loaded font that is easy to read (i.e. Corbel or Myriad Pro), size it at 12 points, and add 140 percent line spacing.