Jomo, I learned how to play the piano about ten years ago but that was only to a beginner's standard! I've played since but not practised...which brings me to my answer to your third question...the more you practise, the better you become.
If you can devote at least four solid hours a day to practising the instrument, and you have the inherent gift for learning AND you have a firm belief that you will be th best pianist in the business, then you may be a professional...in three, four, five years!