The main aim of treating back pain is to identify and prevent further damage to the spine. This is best achieved by seeing your family physician or a specialist. They may order an MRI to exclude any major pathology and to recommend the best course of therapy.
For back therapy, I would recommend seeing an accredited physiotherapist, exercise therapist or even an acupuncturist if you prefer the TCM approach.
Generally, I would not recommend any form of back manipulation unless the MRI shows that the lumbar disc is healthy with no annular tear.