Joe, first these are just my opinions.
Until summer, main lake around Kc does not sound the most productive area. I think it would be extremely more productive to go to one of the river or major creek arms. Aunts Creek is close to Kc and would be where I would head. Head to the back of the arm, as the water temp will be up to 5 degrees warmer back in the extreme back of the arm. Warmer water draws the shad, which will be were the cats are. Mud bottom flats close to deep water, 8' to 20' that can drop into 30' close by would be perfect.
As for bait, If you have any way of doing it, use a thow net and catch some shad in the very backs of the bays as they have been balled up on the surface. I saw some the other day that would have been easy to net. If you dont have a net or at least for back up I would use premade baits in shad flavor (I never go catting looking for shad with out a back up bait, sometimes they are just not avalible). Some of the tackle shops in the area should have some frozen shad that might be the ticket.
Slip sinkers with circle hooks (if you know how to use them) work great for kids. Basically a carolina rig.
Good luck and please let us know how you do.