Glad you asked...
First, start with small introduction about yourself. Write about your personal characteristics and about the things you like and dislike. Then write about your education and experience and about your hobby.
Then again, this answer might help you...
If you want to introduce yourself in an essay start by writing the date and the year of birth. Then write what you do and where you live. Write about your dreams and goals in your life. Write how you see yourself in few years.

