I'd start him at 'short range'
Probably something like 10 or 15 feet.
'Yards' can come later. 
I'd also have a good, solid rest available. It's the easiest way for anyone to shoot, so I wouldn't ask a beginner to start off with anything else.
Regarding the sights, if I was worried about POA/POI, I think I'd fashion targets to match. For example, something in the shape of a hot-air balloon: Aim at the basket to hit the balloon.
Otherwise, I don't think I'd worry about it, and I'd just let 'nature take its course'.
HTH 
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Complete thread:
- Working distance for airsoft "sniper" rifle w/ 6 year old? -
stonewalrus,
2013-07-04, 16:25
![[*]](themes/default/images/complete_thread.png "Open whole thread")
- I'd start him at 'short range' - FOG, 2013-07-04, 16:47
- Working distance for airsoft "sniper" rifle w/ 6 year old? - Slow Hand, 2013-07-04, 18:00
- Working distance for airsoft "sniper" rifle w/ 6 year old? -
RidinLou,
2013-07-06, 23:04
- I've got it hitting dead on at 7 yards with some adjustment - stonewalrus, 2013-07-07, 09:04