A Start for a 10 year old
Most of the guys here are suggesting glo power. Some of them have no experance with electric . I have done both plus gliders and MUCH prefer electric. I used to work in a hobby shop and sold about 90% electric. My suggestion is first find an instructor (usually at a club) then buy whatever he recommends.( most likley it will be .40 sized glo) By the time you are ready for a second plane you will know enough about all of this to decide how to progress in this hobby.