Actually, wrestling video games are a good entryway too. I myself got into wrestling thanks to the old Wrestlemania NES game (yeah, i know, but in 1989-90 it was considered good). Hogan, Andre, and Savage were mainstream and known to me, but i wanted to learn more about Honky Tonk Man, Ted Dibiase, and especially Bam Bam Bigelow, so i started watching the weekly show and getting old tapes to fill in the gap. Find a game with classic wrestlers thats not too complex (no overly complicated button combos to do moves), and it may lead to the child wanting to know more about the wrestlers in the games.