Here is my feedback on a couple of your items, as we just went to DL for the first time last year in November.
1. If you are hoping to stay in a DVC at VGC, and you don't own at VGC, be ready to start booking at 7 months out. Even then you might not get anything. It's very hard to get into VGC if you don't own there. However, if you can get in there, it's AWESOME!!!
2. You will need to arrange for your own transportation from the airport to DL. They don't have Magic Express at DL.

If it's an option for you, I would recommend flying into SNA instead of LAX.
3. If you are on the fence about whether or not to see World of Color, go see it. And do whatever you can to get a viewing spot where you are looking straight on, instead of viewing from the side. You don't need to be in the front rows where you might get wet, just be somewhere that is looking mostly straight on at it. We watched it from the sides the first couple of nights we saw it and then our last time seeing it we were able to see it looking straight on and it was SOOOO much better!!!
4. Mentally prepare yourself for a smaller castle. You will still probably have a bit of shock when you compare it to the Cinderella castle, but at least you were warned.

5. The fireworks at DL are not like anything at WDW. They only go for a few minutes. Nothing like the 15+ minute shows at WDW.
Have a great trip!!