hello Gary! Welcome to our family!
Yes, you can put your site as your sig, just don't "advertise" in your postings. (Basic common sense is always best!) While we sad you can't post your fudge recipes, and even sadder that we're way across the pond....we'd love to hear about your other recipes - you obviously know your way around chocolates....any cookies/cakes you are brilliant with?
As for promoting your site, local craft fairs are a good start, as you mentioned, but are there any large-scale fairs in your area? I know that in my area, there is a huge craft fair that goes from Southern California to Nevada, New Mexico, and Arizona, in about 15 stops. The folks that produce their own foods say it is really the best way to get their product known. Then, when the consumer runs out, they purchase on the website till the fair is back in town.
Best of luck, and we look forward to hearing more from you!