It's free and has a lot of information. 
It was very helpful.

kalrtm5259

For those who want to become an emoticon creator but don't know how to start, I've prepared a lecture that's easy to understand and slow. Those who can use Illustrator or Photoshop can also learn the optimal work method for creating emoticons.

soconsocon24344

Anyone can do it! Make emoticons

입문

초급

중급이상

emoticon

Character Design

Create emoticons with photoshop

Create emoticons with illustrator

Creating natural animations