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USATF (the governing body for track & field) has a program they call “run jump throw” that can be used to introduce the different events to young kids. It’s targeted to ages 7+, but there might be some ideas you can use. They designed it for both PE classes and at-home stuff.
Beyond that, you can search for a club in your area. Unfortunately this new search form no longer has the filters for “youth”, “elite”, “masters”, etc., so just type in your zip code and click through for something that looks professional. Or email all the club organizers.
Beyond that, I highly recommend a book called Total Training for Young Champions. It covers age-appropriate training guidelines from ages 6 to 18 with lots of ideas for activities and drills that are designed for the younger groups. You can buy a used copy for a couple bucks from Amazon.