My Eight Year Old got his first R/C plane for his birthday and we took it out flying today.
I can recommend this as a great starter plane. It’s fully assembled (except for the wings: you strap them on with a pair of rubber bands) and it’s dead easy to fly. It made four flights before coming in for a very hard landing (learner pilots need to lay off the throttle when a crash is imminent: that spinning prop does no good when it meets styrofoam flight and control surfaces) and is now needing repair.
An ideal place to learn the basics of flight would be in the old hangars at Magnuson Park.