There is a turnstile marked for folks with early ADR's. If you finish before the park opens, you can line up at the rope area in the lands. We usually hit Fantasyland first.
If you have an early ADR in the park, you go to the turnstiles to the far right of the Entrance area. There will be a CM there with a list. (S)he will verify that you have an ADR and admit you to the Park.
If you finish your meal before the rest of the Park opens, you will line up at the end of Main Street and wait for Rope Drop.
Have a great trip
they will let you in before the park is open all you need is your PS number. if you are done before the park is open then you will be able to walk around the park. they do not openall of the park.