Different classes will have a different emphasis; some being more physical, whilst others focus on relaxation, breath work and meditation. It is worth speaking to the teacher about their particular approach before joining a class.
Classes last an hour on average, working through warm up exercises and Yoga asanas (postures) and ending with a 15 minute period of relaxation.
As yoga is non-competitive you don’t need to worry about what other students can or cannot do, everybody is different. Listen to your body and do what’s comfortable, beginning with simple exercises and slowing building up to more difficult ones. Yoga is not about twisting the body into strange positions - if there is anything you do not wish to do, you don't have to do it.
You will need to wear clothing that you find easy to move and stretch in. Most yoga is practised barefoot on non-slip mats – check with the teacher to find out if they will be provided. If you are unable or prefer not to use a mat, speak with your teacher about alternative techniques to help your individual needs. Some people find it better to stay seated at first, moving to standing exercises only once they feel ready to do so.