The Magic Kingdom Park is one of the most busiest parks, so knowing what you want to do and see before you arrive is essential.
Its a massive circle split into seven lands.
Main Street
Adventure land
Frontier land
Liberty Square
Tomorrow land
Fantasy land
Mickey's Toontown Fair
I suggest arriving early, about an hour before the opening time. This will give time to get in place to visit many popular attractions. Arriving later in the day will insure you long queue's.
If you have younger children with you I suggest heading straight for the Fantasy land. It is an enchanted place that is home to flying pirate ships, mad tea parties and honey-crazed bears.Once there you'll find it pack with great rides, themes center around Disney films and fairytales.