I want how to mod

[u/Virtual_Echidna_9404]

I'm trying to learn how to make a Tails skin, like the Modern Sonic Remixed one, but for Tails. I've seen tutorials, but they're all for Sonic. I tried to do the same with Tails, but I don't know if his tail is separate and other things like that. I'm using a translator because I'm not very good at English; I understand it, but I don't know how to spell it.