Check out some of the threads on this forum.
I would prefer back lever, front lever, planche, handstands work, and progressive dips and pullups work with some sort of rowing activity. Most stuff on rings.
There's a couple threads with programming. Depends on the person's initial strength. If they're looking to get strong fast then go with something like 3 reps with 3-8 sets. Start with like 3-5 per exercise and build up with need be. Program is EXACTLY like you would for weightlifting so if you have any experience or he does then it's simple.