I highly recommend booking your LL's as soon as you are able. This way you start your 2 hour timer. You'll be able to book more lightening lanes throughout the day this way.
I highly recommend booking LL's as soon as you enter the parks. This will start your 2 hour timer and allow you to book more lightening lanes throughout the day. Once you book your LL, you can continue to modify it and push the time back, if you do not want to use it right away. I agree, that you don't typically need to use LL's for the first couple of hours. Once your 2 hour timer is up (or once you scan into your LL) you can book your next one. Rinse and repeat all day long. Be aware, that on really busy days, LL's can sell out early, especially for popular rides like Guardians, Indiana Jones and Space Mountain. If you don't start looking for LL's until noon you could end up being very disappointed. Also, the modify feature is great and can help you get a better time for your LL.
I also highly recommend you start 2 of your days at DL, and one day at DCA. On your 2nd DL day, you can book your LL's for DCA as long as their return time is after 11am. Then when you hop you can have some LL's lined up for DCA.
The Star Wars projection show is really amazing, I definitely recommend seeing it. I personally, am less impressed with watching the fireworks from Galaxy's Edge. It's good and I enjoy it, but I prefer it from other locations. However, I am not a huge Star Wars fan. And, I come to the parks often enough that I can watch from various locations.
I am currently planning a trip to WDW and am equally confused about all of the different options, tips and tricks! It's a lot to figure out!
Enjoy and have a great trip!