From my recent experience of setting up from scratch, I would recommend buying a decent garden shed and converting it as buying a purpose built loft could prove very expensive. I'm sure like me you will find local fanciers and people on here more than generous in helping out with birds and equipment. This forum is also a fantastic place for gaining knowledge with every topic being covered at one time or another, I have spent many a happy hour reading various threads. Good luck and welcome to a fantastic sport!