On the face of it, I would suggest doing some work for free right away. When people find out you have some skill at it, they'll come beating down your door for jobs very quickly.. Here is where I'd start. Make a few phone calls. Offer your local fire department your services in using your CADD skills in helping to set up their training scenarios. I was on a fire department. Odds are if they think about it, they will come up with a whole lot of uses for your services. Then, you also have access to 20 - 50 guys who will see the quality of your work. Many of them will have a need for someone who knows about CADD, and they all have friends too. If you contact 5 fire departments with your services, within 6 months you'll probably have so much business and so many contacts you'll be working full time to try to keep up. Best of luck.