How do I sell floor plans?

I have always enjoyed drafting floorplans for homes. While I was working for a contractor, he saw some of my plans and told me that I was a ';natural';. He even shared them with a couple of his friends and they couldn't beleive that I haven't had any training. What has always just been a hobby, I am now looking into as a career. I have been told that I can't go back to my regular work because of a nerve injury so I'm hoping that this will help keep my family going. thanks!