When writing a controversial essay on abortion, you need to make sure the facts and statistics you use are supportive of your main argument. However, any good writer will present both sides to the argument and to do that, you need data from both sides. Before you start your research get some note cards and highlighters ready. These tools will help you to make notes as you go.
Whenever you write something down, no matter how trivial or short it might be, note the corresponding bibliographic information including the page number. This will save you heaps of time later when you are reaching your deadline and trying to put together your reference page.
With a controversial essay, it is imperative that you check the sources you plan to use and evaluate their merit. Do not use unreliable sources.
With your notes ready, it is time to start writing. You want to either use the strongest to weakest order or weakest to strongest order for your presentation. This is a decision left to you, because neither is right or wrong.
You can check the organization of your work by using an outline. Even a bullet point outline can help you to play around with the order of your work and find areas where the content might flow better or worse.
With an outline, you can start drafting your thesis statement and your body paragraphs. Most students write the body paragraphs first, then turn to the introduction and the conclusion. This is useful because your introduction and conclusion both need the content from your body and if you try to write them before you have written the body, things will get very complicated very quickly.
Read over the content for clarity and flow. Make any necessary edits and send it in.