Make an outline. Your paper will support a single thesis or main idea. A thesis should state a relationship, preferably a causal relationship. The rest of your paper will elaborate and support this thesis. Your thesis should be clearly stated in a single sentence in the first or second introductory paragraphs.
Every paper builds an argument.
The first one or two paragraphs serve several purposes. Here is where you build your argument and develop your analysis, supporting your ideas with specific material from the text. Your last paragraphs return to your thesis, without providing simply a rehash of your introduction. Here is where you put your ideas together and fully elaborate your thesis. Avoid a purely descriptive paper.