You can also check the automatic sail size / body weight calculator at the link below. As long as the sail you are using is within the range of recommended sail size for the board, and your fin is big enough (you should get a 58 cm), it's pretty accurate.
http://www.vims.edu/general/sailpadd...Calculator.xls
For 95 kg and a 10.5 sail, it says 12 knots would be ideal, but you could probably plane in 10 or 11 knots in a steady breeze.