In some cases it may not be necessary to start your essay with a question. Or, it may not be considered appropriated depending on the type of essay. You can usually get an idea on whether it is acceptable based on guidelines given for the assignment. Sometimes you may start an essay by asking yourself a question versus directing it to the audience. A descriptive or persuasive essay may be appropriate for a asking a question at the beginning. When in doubt you can review ideas with your instructor or colleagues. Be creative with your question and be sure it is something you can answer with accuracy.