Greetings from Finland
It is great that somebody is willing to work with kids and trying to get them involved in our excellent hobby.
One source where you can almost limitless amount of different drawings is.
https://outerzone.co.uk/
Big and small old school and modern.
Other option is to do it completely other way
https://zoomport.eu/shop/RC-Kits-and...00.aspx?page=8
That is just an example, there is other manufacturers. That is great fun to have aerial combat with those planes either in- or outdoors. Just tie piece of paper serpentine behind the fighter. Then launch five to seven planes in the air and thrill is there. They are practically inbreakable and if there is damage then repiar is easy super glue and kicker. And it do not have to be only kids, it is very addictive. Only caveat is, that try to keep performance equal between planes more or less same battery capacity (2C), engine and propellor.
Old Erkki