Outlines should follow this pattern -- you only need a few words for each line:
I. [Background information and main point.]
A. [Background fact]
B. [Background fact]
C. [Thesis]
II. [First supporting point]
A. [Evidence and analysis]
B. [Evidence and analysis]
C. [Summary of first point]
III. [Second supporting point]
A. [Continue pattern above...]
B. ...
...
V. [Conclusion]