Many thanks for all the great tips. I must say I am still a little overwhelmed and somehow, I can’t seem to figure out my rope drop strategy. And I was hoping to get some input and maybe even some help. I will be traveling with a friend who has never experienced any of the Disney parks and I want him to have a good time at DLR. I don’t want him to be (too) overwhelmed by the crowds or to feel miserable from waiting in line for hours

It is more about having a good time than doing all the rides.
Shooting from the hip:
Being in line for security at 7 should be fine, depending on when you are going. Find the shortest line at the esplanade and when they let you in at 7:30 head straight for the Tomorrowland Rope.
Prior to Rope drop, book Indy or Matterhorn to fish for MEP. Keep an eye on the return time for Indy and when it hits about 9:15, cancel and get an actual return for Indy
Also keep an eye on the LL return for rise and purchase when the return time is about 11-11:30am.
At rope drop, go ride (Hyper)Space Mountain Standby. If you are holding Indy and
Then head straight to Matterhorn and ride that standby
Go to Big Thunder and ride that Standby.
Now go to Indy and ride that using LL. Once you scan in get an LL for Haunted Mansion. It should be fairly close in time.
Go ride HM with your LL. Book a LL for Smuggler's run.
Head to Galaxy's Edge, and use your lightning lanes for Smuggler's Run and Rise of the Resistance. Book Splash Mountain.
Get some lunch and enjoy the ambiance of Galaxy's Edge until it is time for Splash.
Then ride Splash with your LL. I like to wait until after lunch as it will be nice and warm by then. Should be close to 1pm now and you can go hit the pool
You can dry run this using the app, though right now things are not terribly busy. When are you going to the parks?