The biggest motivator for me was manga and Saturday cartoons.
If you wanna start a comic just work on the story while sketching out the characters, make sure you have a some sort of solid idea of what you want to do. What type of world they live in, how do the act, look and talk. What style are you going for and so on.Don't just dive in.
Inspiration is all around you and it's never to late to start, just don't wait to long or get deterred because practice makes perfect.