I plan on using all of the material, including the new Marvel shorts that are going to be included on the Thor and Captain America DVDs and Blu Rays. The way I see it, without the full movie, it's hard to get a grasp on the development of the characters. The biggest difficulty will be deciding on where to split the videos.
Iron Man - Tony being captured, which prompts him to build the first suit. He uses it to beat his first baddies in the Middle East. Then Obidiah steals the suit prompting a showdown in public and Tony's "I am Iron Man" reveal.
TIH - Hulk origin. Banner being found and the realization that his blood can affect others. Super Soldier serum (also used for Cap) is used to create Abomination with Banner's blood. Banner voluntarily uses Hulk to defeat Abomination, which means he is starting to learn to control it.
Iron Man 2 - Biggest complaint coming from critics is that it was an Avengers promoter
Thor - Downfall of Loki, who is rumored to be the main villain in The Avengers. Shield capturing Thor's hammer. Thor retrieving the hammer to defeat Loki.