Congrats!!
We just got back a week ago, and although it was our second Disney visit, it was our first time staying and eating onsite - Port Orleans French Quarter. I hope I can offer a little bit of help. We were 2 adults, 1 older child who qualified as an adult in regards to ticket purchase and dining plan, and 1 child under 9.
We booked through 407-WDISNEY and I found that regardless of with whom I spoke on different occasions, they are definitely trained to sell, sell, sell. That said, be aware in advance what you want, need, and are willing to pay for, or else they could talk you into buying more than you wish to pay for.
We chose the "plus" dining plan which gave each person 1 snack, 1 quick service meal (cafeteria type), and 1 table service meal (sit down dinner).
The pros were that we had some very fun and very memorable dinners together as a family, and it was so nice to sit and relax in a nice restaurant at the end of a tiring day of walking. One night we enjoyed a dinner at Teppan Edo, in the Japan area of Epcot, the chef puts on a cute show for the guests, and it's lots of fun for the kids, but the food was just good, not great. We used 2 table service credits to book a show at the Hoop Dee Do Musical Revue, which was lots of fun, and tons of food. All sit down dinners include a drink and a dessert, no one ever left hungry, lol.
The cons were that we felt we should add the Park Hopper option because we may end up in one park during the day, yet have dinner reservations in a different park for the evening. You may consider opting out of the Park Hopper option if you are willing to visit the same park in which you have dinner reservations that night. Another possible con is always being aware of what time your dinner reservations are, making sure you build in adequate time to travel from where you currently are to get to your reservations on time, and possibly having dinner run long enough that you miss out on some 7 pm or 8 pm parades and/or fireworks. In hindsight, I would make reservations earlier, say 5 to 5:30, instead of later. Lastly, if you chose the option with 1 table service plan, absolutely, positively, make your reservations ASAP. We visited during the off-season (Feb 1-7), and attempted to change 2 reservations to earlier times, and could not, everything was booked solid.
If you choose the "plus quick service dining", you get 2 snacks and 2 quick service meals. The benefits to this are you can pop in and out of the restaurants at anytime, you're not tied down to a specific time. You could choose your 2 main meals to be breakfast and dinner, or choose lunch and dinner, or, choose breakfast and dinner, whichever works for your family. Then the 2 snacks could fill in the remaining meal. For example 1 coffee and 1 bagel would use your 2 snacks to make breakfast that day. Or if you had used the quick service credit for your breakfast, then your lunch could be 1 smoothie and 1 muffin. Also, most quick service restaurants offer lighter meals, like salads, and heartier meals, like burger and fries. So quick service won't mean you are going to eat the same thing every day. Both quick service also includes 1 drink and 1 dessert per person.
There are heartier choices for snacks too. For example, Anandupur Cafe in Animal Kingdom offers chicken fried rice, or a basket of french fries, yet each counts as a snack. Another is Pinocchio Village Haus in Magic Kingdom, where you can get a mixed greens salad and a side of fries to use 2 snack credits. Here's one site I found that might help:
As far as transportation, Disney's Magical Express takes you from the airport to the resort, and then back again. Very convenient. The only potential downside is this: our flight home was for 9:30 am, which meant we had to be on the bus leaving the resort at 6:30 am. Ouch, lol. The Magical Express makes several stops at other resorts to pick up more guests, so the trip to the airport took 50 minutes from the French Quarter. Take that into account when planning your time.
Lastly, if you book with Disney, ask them directly if they are offering any specials or promos, such as free dining plan, for the days you are there. I did, and the agent told me point blank that they are not allowed to volunteer that information, but once the guest asks, then they can look it up. She told me that yes, the week we were there qualified for the free dining plan, so that was great news! If there is no free dining during that time, then ask if there are room discounts available, I *think* there is a thread here that posts current room discount codes. Disney won't allow combining 2 discounts together, though, so if both promos are in effect, you will have to choose 1. For us 4, the free dining plan was a pricier freebie than a room discount.
I hope that helps out a little. Enjoy your trip!
ETA: I found the thread with the discount codes:
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Disney Discount Codes and Rates