Yes, the styles will be things you learn in-game, but there will be a default style everyone knows that has various techniques. Generally the harder to acquire styles will be better in some way.
There’s a strong focus on streamlining, so for disable, it’d pick automatically from the techniques you have available. For example, you might have a sand kicking attack (targets eyes, causes blindness), box ears (hits ears of course, causes deafness), and a hamstring. If you don’t have a blade or the target doesn’t have legs you can’t do the hamstring, if the target is already blind you can’t do the sand-kicking, and if it can’t hear you can’t box ears. And probably if you had already blinded the target you’d be less likely to try the blinding attack again.