Do not be afraid to start writing an essay. Take your time with the ideas that you want to imply in your piece of writing. Have your ideas first in your head without putting them down on the paper. When you feel like writing them down, take notes on every idea, word and phrase that comes to your head and relates to the topic of your essay.
There are many different essay styles and it is crucial to know what is expected of you. Universities, colleges and individual tutors will tend to have their own preferences and so it is important to make sure you know the right formula for your course. You can find a lot of information to help you online, but do check everything with your tutor or writing support tutor before you go ahead with writing your essay.