Im in Basic Ballet, and want to know some of the stretching that can help me with splits, scorpian, etc.. ?

Im in basic ballet (Beginners) and Im not exactly little, im a teenager! And i really wanted to take Ballet, and now Im trying to catch up on it, shooting to be where I am suppose to be at this age. But one thing i need is stretching exercises that can help me be more flexible, not regular stretches, but Ballet stretches!