Hey there Gary,
Welcome to planDisney and thanks so much for your question!
Currently, to visit one of the parks of the Disneyland Resort, you need both valid
theme park tickets and a
theme park reservation for each day you plan to visit. These park reservations are made for one individual park unless you have the
Park Hopper add on, which I'm a huge proponent of because of the flexibility it adds to your visit.
The easiest way to make a park reservation, in my opinion, is either through the
My Plans hub on the Disneyland Resort website or through the
Disneyland Resort mobile app. Either option makes it quick and easy and you can also change your park reservation through these place as well!
If you purchased your theme park tickets through the Disneyland Resort website then you should already have your park reservations set - since you make them as part of the purchase process. However, if you'd like to double check then the My Plans hub is a quick and easy way to do so.
Thanks again for your question, Gary! I hope you have fun on your upcoming visit to the Happiest Place on Earth.
Have a Magical Day,
Greg