Hiya, Micky! Thanks for stopping by planDisney and asking your question!
When you purchased your tickets online, you likely selected a date (or dates) that you wanted to visit and which park you wanted to visit each day. If so, that was all you needed to do to make your
theme park reservation. You can double check that your theme park reservation is in place by clicking the "Ticket and Reservation Details" link under the "My Disneyland" menu on the Disneyland Resort website or by looking in your Disneyland app. If you have Park Hopper tickets, then you made a reservation for the park you want to start at each day. Then at 1:00 p.m., you can hop over to the other park.
If you haven't already, be sure to familiarize yourself with the
Disneyland app before your visit. The app will be your best tool for navigating the parks efficiently. You'll be able to see current attraction wait times, use the mobile order feature to order food (and save tons of time) from a variety of quick service locations, and the app is the only way to use the new
Disney Genie service that will be debuting sometime this fall. Disney Genie will create customized park-touring itineraries based on your interests. It will also have Disney Genie+ that will be available for an additional fee that will allow you to skip most of the wait at select attractions by using the Lightning Lane.
I hope this helps. Have a great time at the Happiest Place on Earth!
-Linda