Japanese Koi’s 15/20

I’m looking into starting a Koi fish farm , I know nothing about Koi fish but I wanted input from others on how to start small and on the right track. What kind of Koi to buy and what kind of indoor aquarium to start with first before moving towards a larger tank outside when Koi get larger

Maybe a bit of a strange one…. Has anyone successfully converted a hot tub (not working) to use as a small koi pond ? If so how did you do it ?

Could somebody please ID this koi for me please, he/she has grown so much in the past few months trebled in size

I’m not sure if anyone can help but I’ve seen a lone Koi Carp dumped in the canal near Blaby does anyone know if this can be rescued n rehomed?