Prepare a few clauses representing your country's point of view.

Prepare a speech in favor of your clauses and represent your overall view of the topic at hand.

(Optional) Prepare a policy statement detailing your country's stance on the topic at hand. A policy statement is a short speech before lobbying where countries may present their policies to the committee. 

Have a good grasp of the topic in your committee.

Have an idea of your closest allies and enemies.

Have an idea of countries that share your country's view.