In addition to Lowendal's sugguestion, you can also check with your own teacher to see if he or she thinks that you're ready to teach. If you really would like to start teaching on your own, you can start being a teaching assistant so you have someone to evaluate and follow up your teaching progress.
I think teaching beginners require more than most people think.
The best and most beautiful things in the world cannot be seen or even be touched. They must be felt by the heart. -- Helen Keller