The added bonus is that now you, the writer, are familiar with all of the material in the essay. This familiarity will help you with the next two steps. You need to write the introduction and the conclusion. The introduction usually is written first, but you can reverse these if you prefer. The introduction should grab the reader, perhaps with a story or something in the current news that relates to the subject. The most important thing is that you must remember the thesis statement. It can come at the beginning, or at the end, but should not be buried in the middle.

The final part of the writing is the conclusion. The conclusion ties the entire paper together. The main objective...

You should not add too much to the conclusion that has not already been stated. The conclusion instead should focus on emphasizing the most important arguments from your essay, and tying them directly to the thesis.
The final step is to proofread the essay. This step will help you to correct any obvious errors, but it will also give you a chance to ensure that there is good flow to the paragraph. If there any issues that you notice, this is your opportunity to correct them. Once again, use this opportunity to ensure that you have a clear, strong thesis statement in the first paragraph, and that this thesis is supported by all of the points.