Hello again, Billie!
Planning out park time is my favorite. Since this is your first visit to Walt Disney World Resort, I'd recommend saving the money and focusing on visiting one park a day. It's hard to really absorb the full experience of each park without spending at least one full day in each to discover your favorite parts.
My family always chooses to set up our park days based on
Extra Magic Hours, especially the early ones. Guests who stay on Disney property do not always take advantage of those early hours and that means you can ride more attractions with fewer people in line. If there aren't extra hours available, we often pick out the park that is open the longest so we can get the most experiences in that park in a day.
Another way to make sure we get the most out of a park is we make one
Table Service reservation in a restaurant inside the park we choose to visit. That way, we don't have to lose park time traveling back and forth just to enjoy a yummy meal.
I hope that helps as you continue to plan! I look forward to your next question!
-Jen