Airframe and Duty Station

Waiting for the March board and had some questions my recruiter couldn’t answer

Do they help you mentally figure out a “dream sheet” before airframe selection? I don’t really have a preference between the 3 airframes so I’d honestly be happy with any of them. I understand you don’t really have control over what you get but does any of common core or your interaction with IP’s guide you in a direction?

Also how does duty station or unit assignment/selection work? They asked for my top 3 duty stations in my packet but I doubt that translates to anything 2 years from now.