Choosing a teacher is an important first step. We often learn of a teacher through word-of-mouth or from an advertisement. I would recommend talking with the teacher personally before you start taking lessons, rather than afterward. Tell the teacher why you want to learn t'ai chi and see if the teacher can be of help to you.
Because the range of t'ai chi practice is so very broad, teaching methods vary greatly. Once you actually start taking lessons, you may discover the method your teacher is using is not working for you. That doesn't necessarily mean the teacher is bad nor the method is wrong. Students learn differently. You may need to find another teacher.
I want to sidetrack here for just a moment to address something personal. Students will frequently criticize a former teacher to me. Often the criticisms I hear as faults are undeserving. When mentioning your former t'ai chi teacher, I would ask you to choose your words carefully and let them remain respectful.
Finally, the teacher can only guide you. You will most likely want to practice on your own outside of class. For many this is a stumbling block. You find yourself wanting to do t'ai chi but are just having too hard a time with your own practice and are becoming frustrated, overwhelmed, and discouraged. Take heart. Everyone goes through the same stages of learning. It's all part of doing t'ai chi.
