One of the nice things about yoga is that it doesn't require a lot of stuff. However, there are a few things that are useful to have when starting your yoga practice, especially if you're planning on doing yoga at home.
Yoga mats (also called sticky mats) are used in most yoga classes to provide cushioning and traction. While you can usually rent a mat at a yoga studio, it's a good idea to have your own, for both hygienic and financial reasons. If you're having trouble deciding which mat to buy, this comparison chart breaks it down for you.
2. Mat Bags
Some people love to have a bag for every occasion, others are just as happy throwing everything they need in the trunk of their car. If you fall in the former category, you are going to want one of these bags for your yoga gear if you commute to classes sometimes.
This list includes books that provide great instructions on how to do yoga poses, reference sources, yoga philosophy, and books with amazing aspirational photos.