First things first. You start with the loft, suitable for light/heat, free from draughts, dampness etc, then the system or distances you intend racing, then the stock suitable for your intended racing, once you've done that then the health issue, finally you take the biggest look at yourself. Are you up to the commitment of the job? Mistakes will be made but as long as you learn from them. This is only the start to maybe WINNING. Good Luck.