I don't think anyone has ever actually followed my suggestion to go to Free Comic Book Day, so I'm not going to dink around with trying to talk you into going and, you know, enjoying yourself at no cost, supporting the comic industry, learning more about the medium... blah, blah, blah.
But I thought I'd let you know it was occurring, anyway.
Not free, but costing you a low, low $0.50 will be DC Universe #0. From what I hear, its supposed to be pretty good. But, you know, I don't know. Because when I showed up at Ye Olde Comick Shoppe today, they hadn't received the weekly shipment. Which sort of freaked me out. And means I have to go back to the comic shop again this weekend.
Anyhow, DC Universe #0 is supposed to be a good starting point for anyone wanting to find out not just who Superman, Batman and Wonder Woman actually are as comic characters, but what sort of world they live in (bonus: that world contains AQUAMAN). And even if you don't know and don't care, its about the price of a pack fo gum, so you aren't going to lose much, and you'll get a bit more of a clue as to what the @#$% I'm talking about when I go on one of those rants.
Here's some information on FCBD.
Here are some comics who I think you might be interested in grabbing:
All-Star Superman #1
Tiny Titans #1
Graphic Classics - Special Edition
Disney's Gyro Gearloose
EC Comics Sampler
Marvel Adventures - Iron Man
The Moth - Greatest Hits
Kids Love Comics! Comic Book Diner