EDF’s are much harder to fly than a single prop to begin with, likewise if you have not made many planes before I would advise sticking to FT plans for the first few, before making your own.
Any 20-30A esc with a Bec will work with most smaller motor sizes FT designs. You can get a receiver and Bec for $12-15 new.
If you want to get something in the air with your son, I would still advise a Tiny Trainer with the 3ch wing. You can build that pretty much completely as long as you have a way to centre servos, then get the parts you need to finish the Powerpod and controls near the end of the build. You can even fly it without RC gear/props but with the servos in.
Do you have a stand alone Flysky receiver? If not then one of those would be a good buy, there’s several different types, someone with your radio here can probably recommend one, all are fairly cheap.