Whilst you don't have your teacher to tune your violin for you, you will need to learn to tune it for yourself or get your parents to help you.
Here is some help to get you started, from the Violinist.com website, including some PDFs with the basics and a video to show you what to do to tune both by ear and with a chromatic tuner. There is a written version on their website. Just follow the link below.
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!