When you want to learn yoga or anything new to you, consider the various options that you have for your physical body. Do you have any limits and if so, can you do yoga around these limitations? If so, chances are good that you can find the right yoga facility for you.
When you are considering the right school to learn yoga in, find out what those that have worked there and doing the yoga instruction there have thought about it. Past alumni of the school or even just others that attend the workouts are the best people to talk to.