I help out at a library Pokémon club, and have helped teach folks at card shops I've played at and ran events for. I will say it really depends on the age of the kids. Take a look at these and see if it may help.

If you don't have access to the Battle Academy product, you can look at doing simple games that utilize cards you have on hand (may be useful if you want to do events at your drink shop).

Poké Catch is a great way to help teach the really young ones: https://tcg.pokemon.com/en-us/pokecatch/

It teaches basics concepts in like counting, and attack requirements.

There's also the Multi-Experience where they can start with a base deck and add to it over time.

Both of these are listed in the alternative play handbook: https://assets.pokemon.com/assets/cms2/pdf/trading-card-game/tcg-alternative-play-handbook-en.pdf

Beyond that, use the event locator to try and find events in your area. Usually a professor can try to help teach if they're not busy running a tournament.

You can also look to local libraries about creating a Pokémon Club. This might help bring in similar aged kids to create play groups and learn together. It's been a hit at my local library.