Some great recommendations here already, Western and manga. I'll add one from each:
Understanding Comics by Scott McCloud is an analysis of the medium in a comic book format, panels, speech balloons and all. It'd be a great supplementary read after digging your teeth into some comics, there's some really great insights there.
Oyasumi Punpun by Inio Asano, official English translation came out last year I believe, is a coming of age type story that follows the nameless protagonist 'Punpun' through childhood to adulthood. It's kinda postmodern so if you're looking for something more traditional probably try other texts like Akira first. If you are in the mood for something a bit left-field, however, you should go for it. I should also mention it can get quite heavy at times, particular near the middle onwards to the end. All in all a fantastic read, and I've heard good things about his other works too like Solanin.