Whenever you start a digital model, your first instinct may be to just start modeling without thinking about where you want your model to go. Trust me, you'll save yourself a lot of time and frustration if you make a quick sketch with pencil to plan your model first.
You can start a drawing using traditional tools like pencil and paper and then transfer these artworks to your computer to help you get confident with digital technology. You may be surprised to find that the results turn out even better than if you used a computer alone.