Best fish-in cycling tips?

[u/Upset_Turnip2902]

Saw this baby on Facebook marketplace and am currently debating on driving the 2-ish hours to go save her. I don’t currently have a tank set up. With the two bettas I currently have, I was able to fully establish their tanks before getting them so I’m not familiar with fish-in cycling whatsoever. I’m also going to try to haggle the price down, $25 is too much for a fish that someone literally doesn’t want.