Here's a ruling from the SEC regarding providing advice over the internet: http://sec.gov/rules/final/ia-2091.htm
You could just use Collective2.com. Advantages: - cheap - no need for registration with any agency - shielded from possible lawsuits (well, we are in America) Disadvantage: - there are others like you there so you have to compete You could make a website of your own with all the explanations, stats, profit targets, etc. and link it to your system at C2...
Of course you can get sued in America just for being alive, or even before you are born. Anyway, the site is constructed in a way that the signals given are part of freespeach issues, and not as trading advice. Of course it is debatable, but the point is that the CHANCE of being sued for practicing without a licence is much less there, than to have an own website where you advertise yourself as a financial adviser...
Another disadvantage: Your picks have to actually work (at least on the hypothetical level) in order for you to get paying clients. C2 records and displays your system's track record.