The millennium cases are pretty desirable, someone was looking for them in the yard sale forum recently.
The little 29/40-120 motor will be great (!) in that Initiator, offering a nice range of flights. The G64 reload will give it a long ride.
If Estes is your frame of reference, then you and your girls are in for a real treat. It's fantastic that they like this stuff, enjoy every moment of it! Be aware, E-G motors can require a large field for recovery, so they're not usually park flyer motors.
Glad to hear you joined up with TRA- club launches are a great place to stretch your legs and watch lots of flights while feeling confident that the club has local, state and FAA covered for you.
There are a lot of ways to do recovery, wars have been fought over such things!
If a recovery system isn't provided with the kit, and if it is for that matter, I'd start by downloading Open Rocket. You'll need a good prediction for finished weight, kit specs aren't always dependable. You can build the rocket in the program, then test motors and your parachute sizes. It's free and invaluable. And, there's a huge support team right here, both programmers and expert users. Look at this thread about the latest beta version:
https://www.rocketryforum.com/threads/announcement-openrocket-version-22-02-public-beta-4-is-now-available.171295/
I'm currently a L1 flyer. I was L2 in the past, and my L2 recert rocket is ready and waiting for the opportunity to fly.
Build thread here:
https://www.rocketryforyes I figured if I found it fun as a kid then try to get my kids and see where it goes . Whatever that puts a smile on there face . Yunno . We have alot of estes rockets. C to f engines we have flown . Here are the ones soo far . I want to get into building and launching the big ones. That is a nice rocket. How high does that go . And since I live in San Diego. I launch them off at Fiesta Island. Had To go in water twice. The kids and I love it and my wife is fine with it and very supportive. So thats a win