Whilst you don't have your teacher to tune your instrument for you, you will need to learn to tune it for yourself or get your parents to help you.
Here is some a video to show you what to do to tune. Don't forget you can get apps for your phone to help with tuning or to give you a constant tone.
As with everything, the more you do it, the easier it will get. Don't be too concerned if your first attempts are a bit frustrating and imperfect: just keep trying!