Hair transplantation is an elective process where the hairs are redistributed from one end of the scalp to the other. They are fundamentally two types with independent merits and demerits. You need to understand which is more suitable for you and do not go by the trend. Understand the cost and expectation of the procedure you select. The procedure has few risks and you need to discuss them. Online forum may give you an insight but face to face discussion is must.
Meet a Hair Transplant surgeon.
Medications are an integral part of this treatment and will be started before the surgery and you need to continue them even after.