Possible structures: For and against
X Y OR X Y
X1 Y1 X1 → Y1
↓ ↗ ↓ ↙
X2 Y2 X2 → Y2
You may also find this list of possible rhetorical moves very useful in considering what to include in different parts of your essay.
Establishing Arguments (Purdue OWL)
The Toulmin Method
How weak or strong is your argument? You might find Paul Graham's hierarchy useful in evaluating it. Aim for 'counterargument' at a minimum!
Graham's Hierarchy of Disagreement by Loudachris, licensed under the Creative Commons Attribution 3.0 Unported license.