Posted 27 May 2013 - 08:36 AM
I say pick a character. If you like Batman, pick him. And then go to a shop and buy a new comic or two. And stick with that until you want to expand your horizons more. Or go into a shop once a week, and look for new comics from the characters you like, that came out that week. And if you like it, go buy the back issues.
If I were to suggest comics from each of the characters/teams you said.
Batman, you're gonna want Batman, or Detective Comics, or The Dark Knight. I'd suggest Batman and Robin, but right now it's kind of not friendly to new comers.
Spider-man, personally I haven't read a Spider-man comic in a long time, and at the moment, I don't know if there is a traditional Spider-man book out there. I guess the closest would be Superior Spider-Man. But for the time being, I suggest getting the back catalog stuff. The Marvel Essential series is a cheap albeit black and white way to read the classic story arcs of Marvel books. So I say if you really want to read Spider-man right now, go for those, and eventually Spider-man will be back to normal (Let's just say Peter Parker is currently not Spider-man, but in comics you'll never see a main character gone for too long.
X-Men, go for Uncanny X-Men, or I hear All New X-Men is okay, or if you're a Wolverine Fan, read Wolverine or Savage Wolverine.
As for Iron Man, just go for Iron Man or Invincible Iron Man
I know it's a scary world to enter into, but if you go into a comic shop, and just say, "I'm new to comics, and I want to get into reading Batman." The clerk will usually say, "Yeah, here's a book I really like..." They get comic newbies all the time, and they know exactly what to say. I know the Simpsons has sullied the image of the Comic Book Guy, but they really are nice people.