Hi Terry,
Getting into Disney is easy. Just come to the parks and use your ticket. You can stay from park opening to closing and have a ton of fun.
When staying outside of the Walt Disney World Resorts, you do have options for traveling to and from the parks. You can rent a car and drive to the parks each day and pay daily for parking.
The hotel you are staying at may have a shuttle to the parks. The times they travel vary based on your resort. You could also take a taxi but this could be expensive, and the Lynx, public transportation, can be a long travel time.
As for tickets, you can purchase them
online. This will allow you to customize your ticket. You can add options such as park hopping or water parks. You could also buy them at the parks when you arrive on your first day and your resort may have tickets as well.
Have a magical vacation!
Beth