Where in the US are you? Are you looking for places to get your boaters license or just to go out and wakeboard?
You can get your boaters license online and have it mailed to you.
As for wakeboarding areas, you can go wakeboarding where ever there is a boat launch for public use. If you don't have a boat you can look for places online where they have cable parks. Here is a link:
http://cablewakeboard.com/ go to Cables in the bar menu at the top and go to Pan America It will show you most of the cable parks in the US and some in canada.