2 engines, 1 right hand prop, 1 left hand prop. Does one engine rotate opposite direction or is it a jackshaft in the transmission?

Direction is usually done by the drive. Some true inboard boats have counter-rotating engines. Most if not all Bravo, TRS and # drive boats are standard rotation.

It depends on the drives. On Bravo's, they can run either way and the shift cables are just reversed.