I've seen a lot of people start off with this technique that I'm doing quite commonly, and there's nothing wrong with just performing the basics first and moving your way up:
I start off figure drawings with an oval for the head and simple stick figure lines for the body, just to get an idea of how the pose will go for me.
Next, I end up using blocks and cylinders to help better define the proportions for my sketches.
From there, I just end up refining.
Remember, allow yourself to make mistakes.
It's part of a growing process to learning, and also allows yourself to become better not just as an artist, but as a person too. :)