Here's my short summary for Iron Man:
Tony Stark is an engineering genius and a complete playboy who runs Stark Industries, a weapon company. While in Afghanistan demonstrating his new missile invention he was captured and wounded by Afghanistan rebels. His captors want him to assemble a missile for them but instead he created an armored suit and a means to prevent his death from the shrapnel left in his chest by the attack. He used the armored suit to escape. Back in the U.S. he announces his company will cease making weapons and he begins work on an updated armored suit only to find out that his partner at Stark Industries Obadiah Stane has been selling Stark weapons to the insurgents in the Middle East. He uses his new suit to return to Afghanistan to destroy the arms and then to stop Stane from mishandling his research.