Good approach. i hope your oldest daughter has a putter
I always recommend thin putters for ladies and children for easier grip. The usual suspects are Innova XD and Latitude 64 Spike. Having an easier grip from a thinner disc removes some stress from putting and makes for an easier, more relaxed and more enjoyable experience. And a less strained arm so you can play more or more often and not hurt so easily.
A 150 Leopard is touchier but has way less power requirement than the 150 Valk.
Kids are good at imitation so if you can get someone good to throw some example shots and look at your throws your children should be off to a good start. And who doesn't want more distance now?
You can also spy great players on video. Slow motion makes things easier to see in some parts of the form so i recommend going to Youtube and checking out each video many times over on the channel mfranssila. Some of the videos on the channel lcgm8 too have slo mo footage.
Flat shots need running on the center line of the tee and planting each step on the center line. Anhyzer needs running from rear right to front left with the plant step hitting the ground to the left of the line you're running on. Hyzer is the mirror of that.