Take notes. Be there. Don't get discouraged. Know that foods will taste different and may taste awful or cannot be tolerated as time goes by. A feeding tube may be necessary. Keep him hydrated and exercised. He may or may not want visitors, honor that. Know that he is more scared than you but probably won't admit it.
My wife would probably have a lot more to add to this list. Know this however, you have people here that can help or answer questions as they come up. This won't go on forever. All things have an end and a bratwurst has two! Courage.