To get an ATP (H) straight away, you'll need 200 hours in a helicopter (during which you could get private, instrument and commercial, CFI and CFII) so you might as well get CPL and CFI first.
To get a CPL, you'll need 20 hours dual, and 35 pic on top of an FAA private certificate of some kind. Or do a PPL test then a CPL test.
If you want to get really kinky do this: 20 dual and 10 solo in a Gyroplane. Take a private test in the morning and a commercial test in the afternoon. Then take some helicopter lessons - you can take a CPL helicopter with training as required. No minimums. no solo.