This will help.
http://www.liquidationsports.com/wakeboard_specs.html
there is a lot of good info here. The writer agrees with HIHUMMER that wider would be better for starting out.
http://www.wakeside.com/page/W/CTGY/wakeboard_guide
Google has lots of info regarding the subject of Wakeboarding.
http://www.google.com/search?sourcei...oard%2C+sizing