In your situation dealing with young fishermen who are new to the sport I’d go with the following:
A wacky rigged senko/stickworm. This is a really effective early season bait when fish are in shallow water or under docks. You can simply add a nail weight to one end and turn it into a Neko rig and fish it in deeper water along weedlines at the fish move out to deeper water and structure.
A texas rigged worm. Another bait that can be fished both shallow or deep. It can be fished around shallow cover as well as out on deeper weedlines and structure.
A Jigworm setup with 1/8 or 3/8 oz jighead. This one will excel from late spring all the way till fall.
You will notice all my top choices are plastic setups. To add in a few hard bait options. I will say a Lipless Crankbait and a Spinnerbait should almost always be tied on or available. Young fishermen may have a hard time slowing down enough to fish most plastic applications, But once they do they will probably start catching way more fish. This is why I’d always have both available. For fishermen just getting started you don’t need each setup already rigged on a different rod. I would say you could get by with 2 or 3 rods. A baitcaster in the 6’6″ – 7′ range with a Medium or Medium heavy rating. This one will work for the spinnerbait and probably the texas rig setup. The other rod should probably be a 6-7′ spinning rod with a Medium rating with a fast or extra fast tip. this would cover all the other applications.
Good luck out there and have some fun. keep us posted on how the year is going for you.
If it would help, I’d be more than willing to jump in with you, or you and the kids for a day to maybe show you a few things and help you get started in the right direction. Feel free to contact me anytime thru private messaging.