When you arrive at an interview shake hands with the interviewer/s( firm handshake not weak) and only sit when you are offered a seat. Most interviews start with the question 'tell me something about yourself'. This questions is designed to asses your suitability for the job and is not about how old you are/ where you are from/ your family/ your hobbies etc. If you have never had a job before talk about your educational experience, your strengths, your interests and your goals ( show how you have acquired the skills needed for the job) If you have work experience talk about that and how that experience has helped you develop the skills required for the job. It is a very good idea to prepare a script that includes the information you want to convey. Begin by talking about past experiences and proven success: for example "I have been in the customer service industry for the past five years. My most recent experience has been handling incoming calls in the high tech industry. One reason I particularly enjoy this business, and the challenges that go along with it, is the opportunity to connect with people. In my last job, I formed some significant customer relationships resulting in a 30 percent increase in sales in a matter of months." Next, mention your strengths and abilities: "My real strength is my attention to detail. I pride myself on my reputation for following through and meeting deadlines. When I commit to doing something, I make sure it gets done, and on time." Conclude with a statement about your current situation: "What I am looking for now is a company that values customer relations, where I can join a strong team and have a positive impact on customer retention and sales." Make sure that when you talk about your goals they do not give the interviewer the impression that the job you are applying for is only temporary!

I suggest u can google "elevator speech" or "elevator pitch" which will give me a clue to ur own introduction