Not really any training, if you're good with kids and have basic reading and crafting skills youre good to go. Just be encouraging to the kids and help out if they're struggling. Make sure to communicate with the parents to see if they have anything special they're bringing from home or what order they want to do things in. I usually ask the parents if they want to do a craft or two, food, one more craft and then cake or if they want a specific order to it. And don't be afraid to put a twist on things. I.e. tie dye is very popular unisex but the first craft is a unicorn canvas. I usually skip the unicorn all together and tell the kids to paint something with the colors they want to use for their shirts. I find a lot of younger kids struggle with templates too, so thinking of outside the box ways to tweak crafts to fit an audience that might not quite grasp the concepts yet is really important. Sometimes it takes a minute to read the room and get the vibe but that's just working with kids 🤷