Hi Hi,
https://www.youtube.com/watch?v=92JsFDKvhQo&t=580s&ab_channel=LadyAska
This link is to a wonderful tutorial to make horns,
Also, using the hairstyle section, personally I use the extras, you can make pretty much anything from extra arms to wings to horns
okie pokie dokie, I really hope this helps and good luck with your character creations!