Indeed, the way you design an essay is just as important as your ideas and evidence.
Good structure helps make an essay easier to follow.
Your reader, remember, doesn't know where the essay is going or how it's going to get there. I n experienced writers forget to look at their writing from the reader's point of view, and don't give enough attention to careful organization and clear signposts for where the essay is going. Here's where you bring in background material, tell your story in detail, and work through the argument step by step. Finally, the ending is where you remind your reader of what you argued, and make some larger point that sends him off with a satisfied feeling that he's learned something worth learning, that he hasn't wasted his time. But the simplicity of this standard design also poses a difficulty for you, because it means that to your reader there's nothing immediately distinctive about your essay.