Need help - transitioning from ChatGPT image Gen to SD

I'm just dipping my toes into SD, and the problem I am encountering is I'm sure very common. I decided to post because I just feel lost and all the posts / content I've read has not really helped me. I'm trying to develop fantasy fiction characters to eventually create manga or short graphic novels. I started in chatGPT just dumping my character ideas and, on a whim, asked for an image generation of this character. What it gave me back blew me away - I was hooked. I knew I wanted to push this in the direction of graphic novel type content.