Once you have a flat face to work with, plane the other side of the stock just enough to clean it up and make it parallel to the jointed side. Now you have two flat sides from which to resaw on one piece. Even if you plan to get only two pieces from the stock (and thus resaw from only one face) it is a good idea to plane the other side now, because after resaw it will go through the planer better with a flat face lying on the planer table, as opposed to a rough face. Set up.
