First piece of advice is to check out mousesavers.com. Mary's site is a wealth of information and between that and the DIS, I have saved thousands of dollars. (over my sister who booked a package for the same week; she's staying at PO-R).
You are smart to be thinking ahead, I started planning a year ago for our April vacation this year. Unfortunately, because it is peak season and vacation week, there have been no deep discounts for resorts except the Dolphin which we got at 50% off with our Disney Club Membership. We have booked two rooms for less than the price of one room at other deluxe resorts. Also, dining at S/D is 20% off with DC membership. An added DC bonus is the 800# they give you for resort bookings and dining, and believe me, I think I've gone through more than my $29 DC membership in phone bill savings alone booking, re-booking ressies! The Disney magazine that comes every month is a nice perk, too.
We booked a car rental (rate of $178 because we booked a year out, it is 280 now) through National (Emerald Aisle and DC membership). We are getting our park passes through Connections at a l0% (biggest discount for tickets). I don't know what I would have done without both the DIS and mousesavers; both sites have proven to be invaluable. Good luck in your planning.
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Joanne