Welcome!
Aah yes I remember our first trip well, it was back in 1997 for our DS 4th birthday and our DD was only 10 months old. In those days I was called the Disney "nazi" I literally researched our trip so much that my itinerary would say "Dumbo 9 am, Peter Pan 9:15" and so on. I knew where were going to be each minute of each day. It was insane but I will say it worked like a charm, minus the few unexpected things you have to learn to roll with. I was so into the cammando style because I didn't know if we would ever be back. Little did I know there would a trip each year (sometimes two) including DLR and
DCL.
I think the most important thing is to have a plan. I wouldn't recommend the crazy way I approached it the first time. However a plan is key. Our family really beleives in arriving at the parks at least 30 minutes before the park opens. Touring until about noon or 1 pm and then heading back to the hotel for a break or swim. Then heading out again for dinner at a resort or another park and then leisurely touring at night. In bed by 10 or 10:30 unless we aren't touring a park the next day.
Not sure of the length of your stay, but try not to tour parks for more than two days in a row. Take a break from the parks and see the other resorts, shop in Downtown Disney, go to a water park, rent mouse craft. There are so many other things to do that you can't possibly do them all.
Read as much as possible. These boards are awesome! The "Unoffical" Book is the best in my opinion. As much as I love Disney I steer clear of anything they publish in terms of touring and park recommendations. Not sure if you have found mousavers or allears, but those are among the best. There are also a couple of sites that have a nominal fee for their information that I find useful even after all these years. Part of it is just the fun of reading and planning with all the various informational sites.
I agree it can be totally overwhelming and until you have that first trip under your belt it is difficult to determine what is the best fit for your family. I agree with others that you have go with the flow, the best laid plans go awry.
Seems like you are up for the challenge or you wouldn't be on DisBoards. I am sure you will make it the most memorable experience for your family and they will love you

for it. Sorry I went on for so long.....it just flew off my fingers.
Good luck, happy planning and lots of pixie dust!
