I love yoga ! There are many health benefits from doing yoga, however removing or reducing cellulite is not one of them.
If you want to reduce cellulite, you need to be more mindful of what you eat. Cellulite is nothing more than fat and in order to reduce fat, we need to eat a healthy diet.
Also, while we can reduce cellulite, we'll never entirely get rid of it. 90% of all women in the world have cellulite. And that's okay. If you see a woman in a magazine without cellulite, it's because she was airbrushed to look that way. Do a google search for Raquel Welch. For years, she was considered THE sex symbol. If you look closely, she has cellulite and you know what ? No one cared !!
So, don't beat yourself up because you have cellulite, most women do.
However, if you've never done yoga, I highly recommend starting with a class. a good instructor will show you pose modifications when you need them. You might try a Hatha or Vinyasa style class to start.