If this is the first foray into yoga, welcome! Inner Dimension highly recommend starting with the basics and completing their Yoga for Beginners program to learn the poses safely, and modifications for the body.
If an intermediate beginner, feel free to start with any all-levels classes. Inner Dimension also recommends Yoga 30 for 30 and Journey to Yoga. Of course, make sure to supplement with other styles such as gentle, yin and meditation along the way!