1 ) If you can make Dining Reservations at the Sit down restaurants at this time, it's a good way to take a break for the Quick Dining Service restaurants that you will likely have throughout the day. Blue Bayou ( the most expensive and most popular Full Services restaurant at Disneyland park itself ) is likely already out of dining reservations 1 month out. But you can probably get dining reservations at other Restaurants at lunch or early dinner.
2 ) Download the Disneyland App and sign up for a Disney account to use the Mobile Ordering feature. It saves A LOT OF TIME when ordering food. Just plan it out so that you place an order when you are about to board your next ride and then walk over to pick it up when ready.
3 ) If you can afford it, pay for the Disney MAX PASS option for your ticket. Having the option to get a fast pass via your phone will ( again ) save A LOT OF TIME when trying to going on a popular ride. Also, you will have the option to download all of the pictures that the Disney Photographers take for you at the park.
4 ) For the World of Color night time show at Disney California, be sure to get a FastPass to get access to the area where you can get a good view of the show. It's not required to view the show ( cuz you can see it pretty much anywhere ). But given that this is your first time seeing the show, it's worth it. I think the FastPass ticket machines is over by the Grizzly Rapids ride on the right side when entering the park. When you walk by, just pick one up in the morning or early afternoon.
5 ) For the Fireworks at Disneyland itself, you will see that people start to camp out and site EVERYWHERE on Main street to the Castle up to 90 minutes before to get a great seat. You can do that yourself if you want. But I find that if you just head to the center of Disneyland between the Castle and Main Street about 30 to 45 minutes beforehand, you can make your way through the crowd and find a decent spot to see the fireworks show. It will get crowded, but once you find a spot to sit on the floor....just have someone in your group get some popcorn, churros and cotton candy and just rest a little before the show.
6 ) Fastpass for the Star Wars ride ( I assume ), Space Mountain and Radiator Springs are all given out by Mid to late morning. I have seen instances where the Fastpass Radiator Springs was all gone for the entire day 90 minutes to 2 hours after rope drop. If you are able to, have someone head over to get one as soon as you enter the park in the morning. If you can't get one, it doesn't mean that you can't go on those rides. Just be aware that the wait lines for these specific rides can easily be 90 minutes to 2 hours ( which easily eats up a good portion of your day at the park ) at peak times.
7 ) Get FastPass for the really popular rides if you can and wait in line with Stand By for everything else. I usually plan it out where I get the FastPass for the more popular rides ( like what I mention above ) and then wait in line for Standby for the nearby rides. Given that Fastpass wait times can easily be 2 hours out, I have enough time to go to other rides while waiting.
8 ) Another thing to note is that you can't get a new Fastpass until the start time of the current FastPass that you just got. For example; if it's 12pm now and you get a FastPass for 2pm at the Matterhorn, this means that the earliest that you can get a NEW FastPass for another ride is after 2pm. Between that time, you can simply do Stand-By entry to rides, but you can't get another FastPass to another ride during that time. Also, keep in mind that you have up to an hour to get use the FastPass. This means that if you can't make it to the Matterhorn at 2pm....but at 2:55pm...then they will let you on. Most of the time, the Cast Members checking the FastPass aren't sticklers for time. If you arrive 15 minutes before the start time of the window for your FastPass, they will ask you to wait. But if it's 5 minutes before? they will probably let you in. Same thing about after the window.
I am sure there are others, but these are the only tips I can think of off the top of my head that would be helpful for a First Timer.
Hope this helps!