In the body, the fewer the main points the better. For short classroom speeches, under 10 minutes, you shouldn't have more than three main points. For longer speeches, you probably don't want more than five. Beyond that, audiences will have trouble following and remembering your speech. In the speech, main points should be clearly stated and signposted, marked off as distinct and important to your audience.
Transitions often serve to signpost new points, as do pauses before an important idea.
Always make it easy for your audience to recognize and follow key ideas you don't want them to miss. Cause-effect, like other temporal modes, may be used for past, present, or future events and processes. Cause-effect can also be reversed, from effect back to cause. Categories like these can help you divide your subject matter and organize the main points of your body. In other words, you may want to use analogies.