We learned the hard way what NOT to do the first year that we went to Disneyland with our son (who was 11 at the time). Hubby and I hadn't been in around 20 years either.
Here's what we learned to do:
1. Stay at a Residence Inn (we stayed at the Residence Inn Maingate), where they serve a full continental breakfast. They serve (buffet style)waffles, pancakes, french toast, sausage, bacon, eggs, potatoes, stuff for breakfast burritos, kid's cereal, granola, adult cereals, bagels, toast, fresh fruit, yogurt, milk, coffee, and juice. Just be sure to get there early, because at the last minute, it's hard to find a table.
They have a FULL kitchen (fridge, stove, microwave, dishes, utensils, etc. And THEY will do the clean-up) in the room too, so we bought groceries for lunch and dinner after we got down there. They have rooms with one bedroom, which features 2 queen size beds. They also have a nice couch in the living area which folds out for a bed. There is a pool on the grounds, as well as a coin-op laundry. They have a shuttle to Disneyland that you pay a little extra for. We decided to:
2. Pay to park at Disney. It's one price, and you can go in and out of Disney as many times during the day as you need to.
3. Pack your lunch. We bought stuff for sandwiches, along with fresh fruit and chips. We took water bottles with the Crystal Light on the Go packets. They have a little picnic area outside the main gate, where you can take your lunch, but many people also sit at the little tables just outside the locker room on Main Street.
4. Speaking of the locker room, get a large locker (just inside Disneyland on Main Street) the first thing, when you arrive. I think it's about $14 for the entire day, but it is totally worth it! That way, you can take your lunch in a soft cooler, as well as a backpack with extras like shoes or socks or clothes, in case you get wet or cold.
5. Wear comfortable shoes!!!! Can't emphasize that enough.
6. Use the "Fast Pass" as much as you can. You can only have one out at a time, per ticketholder, but it will save you time. You'll get a little pass that tells you when to come back to that particular ride. So plan your time around that. Then with the Fast Pass, you won't have to stand in a LONG line...you can go right in.
7. The last time we went to Disneyland, which was last year, we wanted to take advantage of the time we had there, but we didn't want to overdo it. Our son is special needs, and while he is fully mobile, he only has 1/2 a heart, and has a pronounced limp because of strokes, so it was imperative to not overdo it. We kept hydrating with lots of water, because when we went, it was in the 100's.
To not overdo it, we got to the park between 9:30 and 10:00 in the morning. We would meet back at the lockers to eat lunch around noon. Then, around 4 or 5 pm, we would head back to the hotel. We would fix dinner, and either go swimming, take a nap, or just watch tv. I know, you can watch tv anywhere, but believe me, it was good to just relax, sitting down!
Then, we headed back to the park around 7pm, using the SAME parking pass which we had purchased in the morning. (You can even leave your backpack and cooler in the lockers while you're gone...just don't leave your valuables.)
The park was open until midnight, so we had another 4 or 5 hours to play.
We didn't carry a lot of bags around the park. My husband carried a backpack with lots of cold water bottles, and we had a camera bag, which we were able to fit inside a Ziploc bag for the wet rides. Inside the camera bag, we kept Band-aids, hand sanitizer, neosporin, ibuprofen, and a couple of other necessities. We had lanyards where we kept our tickets, because you need them handy when you get your Fast Passes.
We did end up eating one meal at a restaurant outside the park, and we did buy a frozen treat inside the park, because it was SO hot! We did a two day park pass, and it seemed to be the perfect amount of time.
If you go to the Disneyland website, you can find good deals on tickets. Usually even better than if you go through a "go-between". They have all sorts of different options, including hotel and ticket packages. They have options where you can get early entry into the park, or meals with the characters.
Weekdays are definitely better than weekends, but in the summer, it won't matter much. It will be crowded no matter what.
I hope this helps. Just remember, to have fun, and really see Disneyland through your children's eyes. It truly IS a magical place when you want it to be. :-)