I wrote a few pages of koi history a few months ago for my club newsletter. Not footnoted etc., and some literary license taken, but a decent overview. Post what you learn and if you show you are doing your own work, I'll share it with you. Then you can point out my errors on the details. But, I warn you, not much in the way of dates. History teachers expect dates, so you'll need to do most on your own any way.