Investigate some children's drawing books. Check out what's available at your public library, or look at options on Amazon. Most such books show very simple steps, starting with circles, ovals and squares and adding simple details...many I would call "whimsical." You'll still need to practice, but it's amazing what you can make with a few simple shapes. I like to doodle. On faces (either animal or people) it's fun to experiment with the shape of eyes (wide open, squinting, etc.) and especially eyebrows to show emotions. Try it and have fun!