Download a copy of Lasors. It's actually free!
It tells you everything you need to know. I guess many on this forum get a bit tired of the same old questions or ones which the first 'poster' can't be bothered to look up.
Check out section E5
Requirements are pretty much below:-
'100hours as pilot of helicopters after issue of ppl.'
'60 hours as PIC'
'20hours x-c flight'
'5 hours theoretical knowledge instruction'
'10 hours dual instruction, this is in addition to any instrument flying completed before the course'
holder of an IR(A) is credited 5 hours