I have no idea what your particular pain clinic will be like, but , in general you should expect to have your physical condition assessed by a team, usually headed by an anaesthetist. You may not actually see the anaesthetist, but she/he will be in charge of your care. The team is likely to include specialist pain nurses, physiotherapists, occupational therapists and clinical psychologists, though not all pain clinics have all of these professionals.
Again, in general, they will assess what interventions can be done to help you with your pain ranging from medication, specialist physio, special aids for walking etc and psychological help to cope with your pain.
Most people attending pain clinics find the experience very positive. Even if they do not manage to reduce your pain, they give a lot of help in terms of coping strategies and skills.
Some have clinicians trained in acupuncture , but by no means all of them.
Google your local NHS services and see if they have a web-site. Some places do. This will give you a better idea. You could also give the Clinic a ring and ask them if they have any literature about themselves that they could send you.
Good luck.