Once again, YU has done us the service of making available R. J. David Bleich's guide to Passover ever that falls on the Sabbath. I still have my copy from when I was in yeshiva. You can download it here.
Important (and disputed) point:
If for any reason it is feared that the use of chometz on Shabbos will in any way lead to inadvertent transgression of the laws of Pesach, egg matzah should be substituted for challah or bread. [According to some authorities the blessing for bread is said before the meal and Grace after Meals afterwards when egg matzah is used in conjunction with the Shabbos meals regardless of the amount consumed. Nevertheless, in view of conflicting opinions, an effort should be made to eat an amount of egg matzah equal to at least approximately 200 grams or 7 ounces at each of the Shabbos meals. The weight of each matzah may be ascertained by dividing the net weight appearing on the label by the number of matzos in the box.] Even if egg matzah is used rather than challah or bread the meal should be completed before the period during which chometz may be eaten has elapsed...Not all authorities agree with this, so ask your local rabbi for an authoritative ruling.
If for some reason it is impossible to complete the chometz meal within the prescribed time, some authorities permit the meal to be eaten at a later hour using egg matzah instead of bread. The use of egg matzah after the time during which chometz may be eaten has elapsed is, however, to be discouraged since egg matzah is ordinarily permitted only to the sick and infirm.