The original Iron Man comic set the foundation with its classic story and character development. Modern adaptations build on that, adding new elements and technology to make it more exciting and relevant for today's viewers. However, they still respect the core essence of the original.
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.