Hi Marni
I discovered ‘Yoga with Adriene’ about a year ago and it has been fantastic. Adriene has heaps of free YouTube videos, anywhere from 10 mins to an hour depending on what you feel like doing and she also has some beginner videos and some specific pose instructional videos if your new to yoga. She is funny, quirky and a pleasure to watch and share your practice with. There is a huge variety of videos and a new one each week. She also has a few 30 day series which are good for a month of solid and varied yoga. I absolutely love it! Definitely worth a look to see if she works for you.
Sarah xx