If you want to become a good cartoonist, then now start drawing with an idea. In a good gag idea is very important. Often you succeed in making people laugh with your idea shown in the cartoon even if your drawing is not that good. Practice to visualize funny ideas and try to draw cartoons showing those ideas. Use written words in the cartoons if there is a need. Put those words in speech bubbles as done in the cartoon shown below. However, try to avoid using too many words. You can also show a funny idea in two panels or more as done in comics.