Not exactly sure what your question is.
An airline pilot is a professional pilot. Likewise a corporate pilot, instructor etc. A professional = commercial = gets paid to fly.
The 1,000 hours for a FO etc position is company dependent. In the US you do need much higher hours to get a jet job etc than in Europe. (Believe me, that's another discussion).
You need to get a CPL (and Instrument rating). Then you need to get a job to get hours and experience so you can move up the chain. I am not sure, but I think you need a few hours before you can take the ATPL theory tests too.
I am sure someone more familiar with the FAA regs will reply.