Well if you're going enlisted first, then the Army is pretty much your only option. One way or another you're going to have to become an officer before they'll let you sit in the pilot seat. Only officers fly.
You could, in theory, compile a warrant officer application packet while working as a crew chief or avionics technician or any one of the enlisted maintenance in Aviation branch. Assuming your packet is accepted, they'll send you to Warrant Officer Candidate School for 4-6 weeks followed by about 18 months of flight school. Just be aware that many of your peers are trying to compile their own warrant packets so there's going to be a lot of competition for it.
Don't be a sh!tbag. If your grades and physical fitness are good you might be able to try for the High School to Flight School option, but those slots are supposedly very difficult to come by. That would send you to basic, possibly AIT, then straight into WOCS and flight school afterwards.
None of them. Helicopter Pilots are not enlisted. They are Officers or go to WOFT.
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