What should the structure of my essay be?

Don't get worked up with HOW much your write, consistency throughout your argument is the most important, you argument must be consistent throughout the whole essay so decide on your argument and structure your essay through that. Your introduction should tell the audience what your argument will be and what points you will make. It is important to still explain and evaluate opposing argument but remember to still move back to your original argument at the end of each paragraph/point you are making.