In Phase One we have:

1.) Captain America: The First Avenger (obviously)

2.) Agent Carter (seasons 1-2)

3.) Agent Carter (DVD extra from Iron Man 3)

4.) Iron Man

5.) Iron Man 2

6.) The Incredible Hulk

7.) The Consultant (DVD extra from Thor)

8.) A Funny Thing Happened on the Way to Thor's Hammer (DVD extra from Captain America: The First Avenger)

9.) Thor

10.) Avengers Assemble

11.) Item 47 (DVD extra from Avengers Assemble)