I don't typeset Hebrew, but as I understand it, there used to be a special Middle-Eastern version of Quark that allowed you to type from right to left. It was necessary for other right-to-left languages like Arabic and (I believe) Farsi. I don't think there is an add-on (XTension) that will let you do right-to-left in a standard version of Quark, but I could be wrong about that.
You might want to try searching for QuarkXPress ME.