1) The AC2 was the lowest rank in the RAF, generally Ground Crew, sometimes Air Gunners
2) RAFVR were "Saturday Afternoon Airmen" who put in weekends and maybe an annual camp.
For many Brits in the 1930's it was to many of them a "Club" to join and in the process give some of their time to the country. (Type RAFVR into Google)
3) He would have been sent there as ground crew or Air Crew in a squadron.
4) You would have to find what he was doing, and many groundcrew have very poor record as to their attachments. If he was a gunner you might find him listed in the aicrew? I'm sure there is some association in England which could help.

If you can get them, "A Bloody Shambles vol 1 & 2 " by Brian Cull et al is about the best coverage of the Air War over Malaya

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Whe're off to see the Wizard, the wonderful wizard of OZ - 6 Australian Infantry Div, Bardia January 1941