Your idea for seeing if you want to get into super hero comics is pretty much exactly how it happened for me.
After seeing the Wolverine movie, a bunch of people I know were bemoaning the treatment of Deadpool in that movie. I knew nothing about Deadpool at that point, and I happened to see a couple of trades of Cable & Deadpool in one of my local comic shops and decided to pick them up to see what the fuss was about.
Well, I loved them, and ended up ordering in the rest of the series, but once I got toward the later volumes it started to reference other comics, such as an issue ending with "Continued in X-Men Supernovas". I initially turned to wikipedia, but I ended up buying Supernovas, which hooked me right into X-Men comics, which lead to me buying a heap more trades and jumping on board with collecting single issues.
Aaaaaand yeah... I now get more than a dozen titles, Marvel, DC and independent on a monthly basis. I'm hooked.