One of the great ones is 'Iron Man: Extremis'. It re - imagined Iron Man's origin in a really cool way. Another is 'The Invincible Iron Man' which has some epic battles against the Iron Monger. And 'Iron Man: Demon in a Bottle' is also a classic that delves deep into Tony Stark's personal struggles while dealing with threats like the Iron Monger.
You can try your local comic book stores. They usually have a good selection of Iron Man graphic novels, including ones related to the Iron Monger. Some big chain bookstores might also carry them in their graphic novel sections.
The first Iron Man comic was 'Tales of Suspense #39'. This comic laid the foundation for Iron Man's popularity and his subsequent appearances in various comic series and story arcs.
The movie Iron Man 1 takes inspiration from various Iron Man comic storylines within the Marvel universe. It combines elements from multiple issues to create a compelling cinematic narrative.
Sure, Iron Man has retired in comics. It might be because he's exhausted, wants to focus on other aspects of his life, or there's a major event that prompts his decision. But comic storylines are dynamic, and he can always return when needed.
You shouldn't do that. Comic books are delicate and not meant to be ironed. The high temperature could cause warping, fading of colors, and even destroy the binding.