For the outline: suggested format is the following:
It is suggested that for 3-4 of these references you write a few lines for the ones that you find to be most useful(the key points/takeways).
1. Your reference typed here
A sentence/line or two about what you found in the reference that was important.
And so on(2, 3, 4 etc), throughout the list.
No specific length requirement, though it typically runs to about 1-2 pages, depending on your topic.