We had a little Lad play in our twos at a club I was at, 12 year old playing division 1 cricket as a leggy, ended up taking over 50 wickets each season for 2/3 years! Got a scholarship to a private school. However this guy is now 18 and doesn’t play anymore, decided he wanted the “gang” lifestyle of selling drugs and hanging around streets such a shame!
When we wanted to play him, he needed written consent from his parents, the local cricket board and the county board, one of the criteria as well was that he had played rep cricket. I would imagine the rep cricket criteria was to make sure only the top few youngsters were playing.
I would say try and find a club that will offer him some age group cricket with his own age group, it is a huge jump to adult cricket. Some of the experiences he may get could put him off, not to say 40/50 overs in the field for a lad at his age could be extremely boring!