Your best bet is to run a couple of days through pay per click to test the conversion rates of those keywords if you dont get any conversions from the keyword then there is no sense in taking the time to build the sit submit it to all the directories to get no income. Also some advise on organic if your not in the yahoo directory then which costs 50 bucks to get in then good luck on your rankings so how many fifty dollar bills do you want to waste before you find a converting keyword. Trust me take the fifty and do a day on ppc you'll save money in the long run and a hell of alot of time