In construction the body of your speech, consider how best to present the logical progression of ideas based on those goals and objectives. Some examples of common ones include: question and answer, compare and contrast, chronological facts and events, and sequential steps.
Using the same methods as you used to create your introduction, craft a conclusion that reiterates the message of your speech. And as much as your introduction needs to be catchy, compelling, and engaging, your conclusion should be memorable. If they remember nothing else from your speech, let them remember your conclusion for better public speaking. And by constructing a conclusion that clearly and concisely summarizes the key elements of your speech, the audience will end up, in a way, remembering you entire speech - or at least the important parts.