After someone has surgery to repair a broken hip, they can receive physical therapy in one of several settings, including at the hospital (post op), in a rehabilitation facility (if start by taking him to a physical therapist. Physical therapy is highly specialized and not something you can or should do on your own.
transferred there), and at home. You didn't specify where your dad is in the process, but regardless, you
The first step for your dad, no matter what level of care he is receiving, is to request a prescription from his doctor for a "physical therapy evaluation and treatment." The prescription must include a written diagnosis and the doctor's signature. Once you have the prescription, you're usually free to go to any physical therapy clinic you want. The doctor may have some recommendations. Call ahead of time and make sure the physical therapy clinic takes your father's type of insurance. Most likely he has Medicare which should cover 80% of the evaluation and treatment costs. If he has a secondary insurance make sure the clinic accepts it and this should cover the rest. Ask the particular clinic for specifics on reimbursement.
Based on the doctor's prescription, the physical therapist will devise a plan for your dad, which may include home sessions, office sessions, or a combination. (Some therapists use swimming pools.) Your father will be given specific exercises to decrease pain, and to improve his strength and mobility. I hope this helps you get your dad started down the road towards recovery.