76-year old COPD dad with L3, L5, T12 lumbar fractures caused by steroid use. Doctors are trying to move from ER to rehab. Please help.

76-year old COPD dad with L3, L5, T12 lumbar fractures caused by steroid use. Trying to move from ER to Rehab. What should I do before discharge? What should I expect at rehab? Is rehab better or skilled nursing facility ? Is kypoplasty a good path forward? Will they try to do physical therapy? He can't stand or walk or go to the bathroom as he is in severe pain. Lots of Qs. It was all so sudden. Please share any experiences if you've been in a similar situation. Any recommendations are much appreciated.