I want to design a car concept. Where do I start?

I'm 13. I know I'm young. It won't go through. I'm not looking to submit it yet but to make a work in progress I can look at later on in life. This is my dream. I want to design a modern day Ford Thunderbird performance concept car. Please be nice. This is what I want to do with my life. I want to become an auto-mechanic engineer and designer.

Come up with a drawing, convert the drawing to a 3d model on a computer, generate a scaled clay model… If you do all this and send an email to the right person at ford showing all your work MAYBE they will be impressed and write you back

Come up with some drawings and play around with some software.