Hi Ron,
I've just started a 14g Biocube as a first saltwater tank. You're welcome to follow my progress
here
In the podcasts, Rob suggested no smaller than a 55 gallon for a beginner. My hope is that if I take it slow, keep up on routine maintenence and stick with hardy specimens, then I should be alright.
Sometimes if you start with something that is harder to do, it can really hone your skills and make having a larger tank even that much easier. Of course, this is how I see it now. I guess we'll see!
Best of luck!