Write out lists on a notepad to help organize your thoughts. First, list your most memorable performing arts experiences. What did these teach you about life? Circle one or two of the most powerful, influential memories. Next, jot down any special skills, talents or interests you have outside of dramatic arts. Colleges look for well-rounded students, even when their school is specialized in a concentration. Finally, write down your goals. Perhaps you have certain courses you'd like to pursue for a special reason, or you want to go into a unique field with your degree.
Write down a list of words or sentences you'll use to catch the eye of your reader...things that apply directly to you and your concentrated field of study. For drama, these may include verbiage such as "the dramatic arts has a way to gain attention for community causes in a way that no other medium has" or "I express myself on stage in a way I otherwise could not." Think of the world as the big picture; how will attending this school help you achieve a greater good, find yourself fully, etc.?
Check with your potential university's website to see if it offers any personal statement tips. Even better, see if there's any sort of student forum for current drama students. You may be able to glean some wisdom by contacting others who've already been successful at what you're trying to do.
Write your personal statement with six basic paragraphs, referring frequently to your prepared lists. The first paragraph should introduce who you are and why you're interested in the drama field. Paragraph two should cover what you've done related to your field of study outside the classroom. This could include any plays you've written, produced or acted in, or you could talk about a summer you spent teaching acting skills to children or participating in another volunteer activity. Paragraphs three and four should include work and school experience, while paragraph five focuses on outside interests. Finally, your sixth paragraph should conclude with why you hope to attend that specific university, as well as some sort of closing comment that will help readers remember what you wrote.
Keep a positive outlook when writing your statement. Keep the drama out of the drama application, so to speak. Admissions boards love cheerful students, so the more you can exemplify personal growth and a sunny disposition, the better. Apply any life experience you can to your future endeavor as a university student majoring in theater.
Proofread your statement several times, or even better, give it to someone else to review. The last thing you want to do is detract from the content by failing to correct typos, grammar errors, etc.