I think, as long as you really like it, you can teach yourself, because the introduction to graphic design is relatively simple, and the difficult thing is to improve it.

Self-taught, and now I have been doing graphic design for more than 7 years:)

On the software side, you must learn photoshop to handle bitmaps and two others to handle vector images (Illustrator and coreldraw). You can choose one of them, and I suggest you learn Illustrator, because this software and photoshop are produced by the same company and have good compatibility. And coreldraw's file can't be opened in photoshop. .