Dacid he meant Okizeme for #3.
Part of it is getting used to the damn rolling and tech system. Bang's wakeup game is of course more complex than SFIV Gief, but you have more options (as do they). Learn what their options are out of tech (as well as say each character's DP), then you can apply your own counter options (catching rolls, bumpers, blockstrings, mixups, air tech resets, delayed tech resets/pickups).
For 5, with the example you provided for instance, generally 6c combos will do more damage/more seals. The combos that generally matter with Bang aren't too hard and you can change them based on your playstyle (seals/oki/damage etc.)