If you want to learn acupuncture, it's essential that you find a reputable college that offers a Diploma.
Given the nature of the system it is essential that when you learn acupuncture you first have the theoretical foundation in place. This involves modules in Anatomy and Physiology, as well as the theoretical concepts behind the treatment.
This would include the location of and function of key acupoints. In a typical course, you will be taught the location of around 100 key points to begin with, allowing you to become familiar with the body and a variety of different health issues.
When you learn acupuncture, before you actually insert needles for the first time, you must be able to comfortably locate the acu-points, and use your hands to detect pathological changes in the underlying tissues. Obviously, no student should ever insert a needle into a patient without this theoretical and clinical experience.
Once you have completed this introductory level you will need to take the time to practice and reinforce the basic skills you have acquired. Only then will you be ready to study at a more advanced level.
This would involve studying a variety treatment techniques, including tongue and pulse diagnosis, plus the place of this form of treatment holds within the total picture of Traditional Chinese Medicine (TCM).
If you are already a medical practitioner of some type - for example doctor, nurse, physiotherapist, osteopath, chiropractor, homeopath - then you may be able to seek exemption from some of the early modules, such as anatomy and physiology.