For some people it's difficult to start drawing and that's completely normal, so don't worry if your drawing isn't perfect at the first try. Many people start with drawing a whole body and that's good but not the easy way instead of that we recommend to start with drawing a head The head is very important and helps you with the proportions from the body (The head usually fits 7 times in the human body and 2 times in a chibi) .
Try it out and have fun.