You already know how I feel about the importance of getting to the parks early.  The first step in planning your day at the parks should be to find out what the Disney park hours are.

The official website lists the Disney hours here.  Once you find out when the parks open each day you should allow plenty of time to travel to each park.  We try to be at the front gates about 30 minutes before they open.  This tip alone will really set the tone for your day and allow you to have so much more fun at the parks.

The Disney hours are always changing so be sure to check the website before you leave for your trip just in case the hours have changed.