Hey there, Barbara!
Thanks for stopping by the Disney Parks Moms Panel with your question. I am excited you are planning on making your dining reservations as early as possible! Being a planner definitely helps make sure you can get every dining experience you want on your trip.
Disneyland Resort Table Service restaurants,
Character Dining experiences, and Dining Packages can be booked up to 60 days in advance online, on the
Disneyland app, or by phone. As you mentioned, you can call the Disneyland Dining line from 7 AM to 9 PM Pacific Standard Time. Reservations are available online and on the Disneyland app also starting at 7 AM PST. I recommend starting to check about 15 minutes before this time online, because in the past I have sometimes seen them become available slightly before 7 AM. If a reservation you want is booked, always keep trying leading up to your trip. Many times I have been able to snag a last-minute or even day-of reservation for dining experiences!
Some of my favorite (and also most popular) dining experiences are Character meals, Blue Bayou Restaurant, Carthay Circle Restaurant, and Lamplight Lounge for brunch. I recently also attended Afternoon Tea at Steakhouse 55 which is only available certain days, so I would recommend booking this ASAP if you are interested.
I hope this helps, and please return if you have any other questions. Have a magical day!
-Jennifer