So if you are concerned about your writing skills, consider getting some help with things like paragraph structure, punctuation and grammar and spelling. Most colleges provide this free and you will also be able to find many free resources online. The first thing you need to be clear about before you start your essay is the type of essay you will be writing.
Before you begin, make sure you know the word limit for your essay. You will usually be given a definite number eg 1500 words or 2000- 2500 words. If you are given a fixed number, it is usually acceptable to write 10% fewer or 10% more words. If you are given a range, try to stay within that range. However, check this with your tutor as you do not want to be penalized.