EASA CPL(H) to EASA CPL(H)
1: You'll need to get a PPL(A) first I think you get about 6 hours credited, so about 39 hours.
2: You'll need to do the full CPL(A) + Night course, but you can credit 100 hours of helicopter time, so you effectively need 100 hours FW before you can take the CPL(A) test.
There are always other options: You can get an FAA PPL(A) in 30 hours (or 19 depending on who you ask.) You could technically go straight to FAA CPL(A) - (you'd need endorsements for 50 hours solo) - then its a reduced 18 hour EASA conversion, no night rating needed. Ultimately, you need 100 hours in a Plane.