Hi David,
That is a tough question to answer as we only have limited space to reply and each and every family will have different routines, preferences and must-dos.
The Little Big Book of Magic which is a FREE Holiday Planning Tool designed for Guests visiting the Walt Disney World Resort from the UK & Ireland, does include a suggested itinerary for a two week visit (on pages 76-77) which may be a good starting point.
The unofficial website www.touringplans.com also has some great one and two day touring plans available for the 4 Disney Theme Parks with some specifically aimed at girls ages 4 - 8 which would be perfect for your family.
As you will be visiting for 2 weeks, you will have plenty of time to experience all that is on offer at the Walt Disney World Resort. My main advice to you would be to try to not do too much at once and to make sure that you factor in some down time so that the girls don't get too tired.
As you will be staying at Disney's Beach Club Resort which is home to
Stormalong Bay (arguably the best pool on Disney property), you are going to want to set some time aside to make the most of the gorgeous sand-bottomed pool, lazy river and 230-foot-long waterslide.
Wishing you a magical holiday filled with memories which will last a lifetime!
Emma