Hi Shunikwa,
I certainly understand that planning your first trip to Walt Disney World can be overwhelming!
I think that you have picked great parks. I suggest that you do Epcot first. Some children love Magic Kingdom Park so much that they are disappointed by any other park after that. Also, consider separating your theme park days. Since you are going to be in the Orlando area for a while and at the parks for two days, a restful day at the pool between theme park days may help you to enjoy the parks more.
I suggest that you check the
Disney World theme park hours. You should avoid parks with Extra Magic Hours in the morning. These are for guests staying at a Walt Disney World resort and will tend to make the parks more crowded in the morning. Once you choose your dates for each park, I suggest that you arrive at the turnstiles about 30 minutes before the park opens. You can get a lot done in those first few hours when the park is less crowded.
It will be impossible to do absolutely everything at each park, and that's okay. Even though I've gone many times, I still haven't seen everything! I suggest that you let your daughters make
free customized maps of the theme parks. They can choose attractions that they are interested in seeing. If you let each choose, say, three attractions each, then you can plan your day to see those attractions. Also, order the free
Disney Parks planning DVD. You can show this to your daughters to help them pick attractions that they really want to see.
I am limited in the amount of space that I have to answer, Shunikwa, but I hope that this gives you a good start on planning. Please do not hesitate to ask if you have any further questions!