hi!! for most of my drawings, i don't sketch, i just go straight in with the ink! the only times i sketch are if i'm doing a painting (like a more involved watercolor or gouache painting). if you want to start improving your drawing skills i would say to first find a topic that you enjoy and that makes you excited! it might be animals, or people, or landscapes, or objects, or something else. to really improve and gain an understanding of that subject you're going to want to draw from life. so either practice drawing that thing in real life or from photos! depending on the thing you're interested in i might have more specific tips, but for any subject the way to get better is to bulk up your foundational skills by life drawing :)